Infiniti QX4. Electrical System (2003 year). Manual — part 22

DTC 63 RELEASE SW CIRCUIT

=NBEL0468S13

1

CHECK SOLENOID/RELEASE SWITCH AND ICC UNIT CHECK CONNECTOR

1. Turn ignition switch OFF.
2. Disconnect brake booster solenoid/release switch connector and ICC unit connector, and connect them securely again.

Then erase DTC. After that, perform self-diagnosis of ICC system again.

OK or NG

OK

䊳

쐌

Poor connector connection

쐌

Check connector. (Check connector housing for disconnected, loose, bent, and col-
lapsed terminals. If any malfunction is detected, repair applicable part.) After repair,
erase DTC, and perform ICC system running test. Then perform self-diagnosis of ICC
system again.

NG

䊳

GO TO 2.

2

CHECK HARNESS SOLENOID/RELEASE SWITCH AND ICC UNIT

1. Turn ignition switch OFF.
2. Disconnect brake booster solenoid/release switch connector and ICC unit connector.
3. Check continuity between ICC unit harness connector B158 terminal 6 (L/B), 15 (P/B), 22 (R) and Brake booster har-

ness connector E137 terminal 1 (L/B), 3 (P/B), 2 (R).

SKIA1183E

MTBL1232

OK or NG

NG

䊳

쐌

Repair harness between brake booster solenoid/release switch and ICC unit

쐌

After repair, Erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

GO TO 3.

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INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-341

3

CHECK RELEASE SWITCH POWER SUPPLY CIRCUIT

쐌

Check voltage between ICC unit harness connector B158 terminal 6 (L/B) and ground.

SKIA1184E

Approx. 10V

OK or NG

NG

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

OK

䊳

GO TO 4.

4

CHECK RELEASE SWITCH

쐌

Check release switch. Refer to “Release Switch” EL-373.

OK or NG

NG

䊳

쐌

Release switch malfunction

쐌

Replace booster. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

OK

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-342

DTC 65 PRESSURE CONTROL

=NBEL0468S14

1

OPERATION CHECK

쐌

Check foot brake pedal operates normally.

OK or NG

NG

䊳

쐌

Check brake circuit.

쐌

After repair, Erase DTC, and perform active test (BOOSTER SOL/V3) with CONSULT-
II. Then perform self-diagnosis of ICC system again.

OK

䊳

GO TO 2.

2

CHECK BOOSTER SOLENOID

쐌

Check booster solenoid. Refer to “Booster Solenoid” EL-373.

OK or NG

NG

䊳

쐌

Solenoid malfunction

쐌

Replace booster. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

OK

䊳

GO TO 3.

3

CHECK HARNESS BETWEEN SOLENOID/RELEASE SWITCH AND ICC UNIT

1. Turn ignition switch OFF.
2. Disconnect ICC unit connector and brake booster solenoid/release switch connector.
3. Check continuity between ICC unit harness connector B158 terminal 10 (BR), 12 (Y) and brake booster solenoid/

release harness connector E137 terminal 4 (BR), 6 (Y).

SKIA1269E

MTBL1231

OK or NG

NG

䊳

쐌

Repair harness between brake booster solenoid/release switch and ICC unit

쐌

After repair, Erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

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INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-343

DTC 74 LASER BEAM OFF CNTR

=NBEL0468S15

1

DIAGNOSTIC CHECK

1. Adjust laser beam aiming. Then erase DTC, and perform ICC system ICC system running test.
2. After that, perform self-diagnosis of ICC system. Is DTC 74 LASER BEAM OFFCNTR indicated?

Yes or No

Yes

䊳

쐌

Replace ICC sensor, and adjust laser beam aiming.

쐌

After that, Erase DTC and perform ICC system running test. Then perform self-diagno-
sis of ICC system again.

No

䊳

Inspection is completed.

DTC 81 POWER SUPPLY VALVE

NBEL0468S16

1

CHECK ICC UNIT REFERENCE SIGNAL

1. Start the engine.
2. Turn ON/OFF switch ON.
3. Check voltage between ICC unit harness connector B160 terminal 57 (R/B) and ground.

SKIA1186E

Approx. 0V

OK or NG

NG

䊳

GO TO 2.

OK

䊳

GO TO 3.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-344

2

CHECK HARNESS BETWEEN ICC UNIT AND ASCD PUMP

1. Turn ignition switch OFF.
2. Disconnect ASCD pump connector.
3. Check voltage between ASCD pump harness connector E139 terminal 1 (R/B) and ground.

SKIA1188E

Approx. 0V

OK or NG

NG

䊳

쐌

Repair harness between ICC unit and ASCD pump

쐌

After repair, erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

3

CHECK ICC UNIT REFERENCE SIGNAL

1. Start engine.
2. Turn ON/OFF switch ON.
3. Check voltage between ICC unit harness connector B160 terminal 70 (Y/R) and ground.

SKIA1187E

Approx. 0V

OK or NG

NG

䊳

쐌

Repair harness between ICC unit and ASCD actuator

쐌

After repair, erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

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INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-345

DTC 83 POWER SUPPLY VALVE

=NBEL0468S17

1

CHECK ASCD ACTUATOR

쐌

Check ASCD actuator. Refer to, “ASCD Actuator” EL-373.

OK or NG

NG

䊳

Replace ASCD actuator. Erase DTC, and perform self-diagnosis of ICC system again.

OK

䊳

GO TO 2.

2

CHECK HARNESS BETWEEN ICC UNIT AND ASCD PUMP

1. Turn ignition switch OFF.
2. Check continuity between ICC unit harness connector B160 terminal 57 (R/B), 72 (L/R) and ASCD pump harness con-

nector E139 terminal 1 (R/B), 4 (L/R).

SKIA1189E

MTBL1234

OK or NG

NG

䊳

쐌

Repair harness between ICC unit and ASCD pump

쐌

After repair, erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

GO TO 3.

3

CHECK CONNECTOR ASCD PUMP AND ICC UNIT

쐌

Check ASCD pump and ICC unit terminal for looseness and bend.

OK or NG

NG

䊳

Repair terminal or connector. Erase DTC, and perform self-diagnosis of ICC system
again.

OK

䊳

Replace ICC unit. Erase DTC, and perform self-diagnosis of ICC system again.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-346

DTC 85 AIR VALVE [LOW VOLTAGE]

=NBEL0468S18

1

CHECK ASCD PUMP

쐌

Check ASCD pump. Refer to “ASCD Pump” EL-374.

OK or NG

NG

䊳

Replace ASCD pump. Erase DTC, and perform self-diagnosis of ICC system again.

OK

䊳

GO TO 2.

2

CHECK HARNESS BETWEEN ICC UNIT AND ASCD PUMP

1. Turn ignition switch OFF.
2. Check continuity between ICC unit harness connector B160 terminal 57 (R/B), 71 (G/Y) and ASCD pump harness con-

nector E139 terminal 1 (R/B), 2 (G/Y).

SKIA1190E

MTBL1235

OK or NG

NG

䊳

쐌

Repair harness between ICC unit and ASCD pump

쐌

After repair, erase DTC, and perform self-diagnosis of ICC system again.

OK

䊳

GO TO 3.

3

CHECK CONNECTOR PUMP ASCD AND ICC UNIT

쐌

Check ASCD pump and ICC unit terminal for looseness and bend.

OK or NG

NG

䊳

Repair terminal or connector. Erase DTC, and perform self-diagnosis of ICC system
again.

OK

䊳

Replace ICC unit. Erase DTC, and perform self-diagnosis of ICC system again.

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INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-347

DTC 87 RELEASE VALVE [LOW VOLTAGE]

=NBEL0468S19

1

CHECK ASCD PUMP

쐌

Check ASCD pump. Refer to “ASCD Pump” EL-374.

OK or NG

NG

䊳

Replace ASCD pump. Erase DTC, and perform self-diagnosis of ICC system again.

OK

䊳

GO TO 2.

2

CHECK HARNESS BETWEEN ICC UNIT AND PUMP

1. Turn ignition switch OFF.
2. Check continuity between ICC unit harness connector B160 terminal 57 (R/B), 70 (Y/R) and ASCD pump harness con-

nector E139 terminal 1 (R/B), 3 (Y/R).

SKIA1191E

MTBL1236

OK or NG

NG

䊳

쐌

Repair harness between ICC unit and ASCD pump

쐌

After repair, erase DTC, and perform self-diagnosis of ICC system again.

OK

䊳

GO TO 3.

3

CHECK CONNECTOR ASCD PUMP AND ICC UNIT

쐌

Check ASCD pump and ICC unit terminal for looseness or bend.

OK or NG

NG

䊳

Repair terminal or connector. Erase DTC, and perform self-diagnosis of ICC system
again.

OK

䊳

Replace ICC unit. Erase DTC, and perform self-diagnosis of ICC system again.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-348

DTC 90 STOP LAMP RLY FIX

=NBEL0468S20

1

CHECK CONNECTOR ICC UNIT

1. Turn ignition switch OFF.
2. Disconnect and check ICC unit connector.

OK or NG

NG

䊳

쐌

Connector malfunction

쐌

After repair, erase DTC, and perform ICC system running test. Then perform self-diag-
nosis of system.

OK

䊳

GO TO 2.

2

CHECK STOP LAMP SWITCH, AND ICC BRAKE SWITCH ITCH

With CONSULT-II

쐌

With data monitor, check that “STOP LAMP SW” and “BRAKE SW” operate normally. Refer to “DATA MONITOR”
EL-311.

OK or NG

NG

䊳

쐌

BRAKE SW: GO TO 3.

쐌

STOP LAMP SW: GO TO 8.

OK

䊳

GO TO 11.

3

BRAKE SWITCH INSTALLATION AND ADJUSTMENT INSPECTION

쐌

Check brake switch for proper installation and adjust if necessary.Refer to “BRAKE PEDAL” in “BR” BR-12.

OK or NG

NG

䊳

After adjustment, erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

OK

䊳

GO TO 4.

4

CHECK ICC BRAKE SWITCH AND STOP LAMP SWITCH

쐌

Check ICC brake switch and stop lamp switch. Refer to “ICC Brake Switch and Stop Lamp Switch” EL-372.

OK or NG

NG

䊳

Replace ICC brake switch. Erase DTC and perform ICC system running test. Then per-
form self-diagnosis of ICC system again.

OK

䊳

GO TO 5.

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INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-349

5

CHECK ICC BRAKE HOLD RELAY

쐌

Disconnect ICC brake hold relay E136, and check continuity between ICC brake hold relay harness connector terminal
3 and terminal 4.

SKIA1192E

Continuity should exist.

OK or NG

NG

䊳

Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Then
perform self-diagnosis of ICC system again.

OK

䊳

GO TO 6.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-350

6

CHECK HARNESS THROUGH ICC BRAKE HOLD RELAY, ICC BRAKE SWITCH, ICC UNIT

1. Disconnect ICC brake hold relay E136, ICC brake switch M150, ICC unit harness connector B159.
2. Check continuity between ICC brake hold relay E136 terminal 3 (OR) and ICC brake switch M150 terminal 1 (OR).
3. Check continuity between ICC brake hold relay E136 terminal 3 (OR) and ground.
4. Check continuity between ICC brake hold relay E136 terminal 1 (L/W) and ICC unit harness connector B159 terminal

47(LG/B).

5. Check continuity between ICC unit harness connector B159 terminal 47 (LG/B) and ground.

SEL536Y

SKIA1272E

MTBL1237

MTBL1238

MTBL1239

MTBL1240

OK or NG

NG

䊳

쐌

Repair harness between ICC brake hold relay and ICC brake switch

쐌

Repair harness between ICC brake switch and ICC unit

쐌

After repair, erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

GO TO 7.

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INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-351

7

CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.
2. Check voltage between ICC brake hold relay E136 terminal 4 (W/G) and ground.

SKIA1194E

Approx. 12V

OK or NG

NG

䊳

쐌

Malfunction of fuse, or ICC brake hold relay power supply system harness

쐌

After repair, erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

8

CHECK BRAKE LAMP ILLUMINATION

1. Disconnect ICC brake hold relay connector.
2. Check stop lamp circuit.

OK or NG

NG

䊳

After repair, erase DTC and perform ICC system running test. Then, perform self-diagno-
sis of ICC system again.

OK

䊳

GO TO 9.

9

CHECK ICC BRAKE HOLD RELAY CIRCUIT

1. Connect ICC brake hold relay connector.
2. Disconnect stop lamp switch connector.
3. When brake pedal is not depressed, make sure that stop lamp does not illuminate.

OK or NG

NG

䊳

GO TO 10.

OK

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-352

10

CHECK ICC BRAKE HOLD RELAY

1. Disconnect ICC brake hold relay.
2. Check continuity between ICC brake hold relay terminal 6 and terminal 7.

SKIA1195E

Continuity should not exist.

OK or NG

NG

䊳

Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Then
perform self-diagnosis of ICC system again.

OK

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

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IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-353

11

CHECK HARNESS THROUGH ICC UNIT, ICC BRAKE HOLD RELAY, AND GROUND

1. Disconnect connectors of ICC unit and ICC brake hold relay.
2. Check continuity between ICC unit harness connector B159 terminal 47 (LG/B) and ICC brake hold relay E136 terminal

1 (L/W).

3. Check continuity between ICC unit harness connector B159 terminal 47 (LG/B) and ground.
4. Check continuity between ICC brake hold relay harness connector E136 terminal 2 (B) and ground.

SKIA1272E

SKIA1271E

MTBL1239

MTBL1253

MTBL1254

OK or NG

NG

䊳

쐌

Repair harness through ICC unit, ICC brake hold relay, and ground

쐌

After repair, erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

GO TO 12.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-354

12

CHECK ICC BRAKE HOLD RELAY

쐌

Check continuity between ICC brake hold relay terminal 1 and terminal 2.

SKIA1197E

Continuity should exist.

OK or NG

NG

䊳

Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Then
perform self-diagnosis of ICC system again.

OK

䊳

GO TO 13.

13

CHECK ICC UNIT STANDARD VOLTAGE

With CONSULT-II

1. Connect connectors of ICC unit and stop lamp switch.
2. Active test (STOP LAMP:STP LMP DRIVE ON) with CONSULT-II, check voltage between ICC unit harness connector

B159 terminal 47 (LG/B) and ground.

SKIA1273E

Approx. 12V (during active test)

OK or NG

NG

䊳

Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-
diagnosis of ICC system again.

OK

䊳

GO TO 14.

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IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-355

14

CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT

1. Check voltage between ICC brake hold relay E136 terminal 6 (R/Y) and ground.

SKIA1198E

Approx. 12V

OK or NG

NG

䊳

쐌

Malfunctions of fuse or ICC brake hold relay power supply harness

쐌

After repair, erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

GO TO 15.

15

CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC UNIT

1. Disconnect connectors of ICC brake hold relay and ICC unit.
2. Check continuity between ICC brake hold relay E136 terminal 7 (G/Y) and ICC unit harness connector B159 terminal

38 (G/Y).

3. Check continuity between ICC brake hold relay E136 terminal 7 (G/Y) and ground.

SKIA1199E

MTBL1243

MTBL1244

OK or NG

NG

䊳

쐌

Repair harness between ICC brake hold relay and ICC unit

쐌

After repair, erase DTC and perform ICC system running test. Then, perform self-diag-
nosis of ICC system again.

OK

䊳

GO TO 16.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-356