Acura RSX Honda Integra. Manual — part 141

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11-270

PGM-FI System

MIL Circuit Troubleshooting (cont’d)

ECM/PCM CONNECTOR A (31P)

VCC2
(YEL/BLU)

ECM/PCM CONNECTOR A (31P)

VCC2
(YEL/BLU)

75. Measure voltage between body ground and ECM/

PCM connector terminal A20.

Go to step 83.

Go to step 76.

76. Turn the ignition switch OFF.

77. Disconnect the connector from each of these

sensors, one at a time, and measure voltage
between body ground and ECM/PCM connector
terminal A20 with the ignition switch ON (II).

• Throttle position (TP) sensor
• Input shaft (mainshaft) speed sensor

Replace the sensor that restored 5 V when

disconnected.

Go to step 78.

78. Turn the ignition switch OFF.

79. Jump the SCS line with the HDS.

80. Disconnect the connector from these sensors:

• Throttle position (TP) sensor
• Input shaft (mainshaft) speed sensor

81. Disconnect ECM/PCM connector A (31P).

Wire side of female terminals

Wire side of female terminals

Is ther e about 5 V ?

Is ther e about 5 V ?

05/06/27 17:38:40 61S6M040_110_0270

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11-271

ECM/PCM CONNECTOR A (31P)

VCC2
(YEL/BLU)

ECM/PCM CONNECTOR E (31P)

VCC3 (YEL/BLU)

ECM/PCM CONNECTOR E (31P)

VCC3 (YEL/BLU)

82. Check for continuity between ECM/PCM connector

terminal A20 and body ground.

Repair short in the wire between the ECM/

PCM (A20) and the TP sensor, or input shaft
(mainshaft) speed sensor.

Update the ECM/PCM if it does not have the

latest software, or substitute a known-good ECM/
PCM (see page 11-6), then recheck. If the symptom/
indication goes away with a known-good ECM/PCM,
replace the original ECM/PCM (see page 11-284).

83. Measure voltage between body ground and ECM/

PCM connector terminal E5.

Update the ECM/PCM if it does not have the

latest software, or substitute a known-good ECM/
PCM (see page 11-6), then recheck. If the symptom/
indication goes away with a known-good ECM/PCM,
replace the original ECM/PCM (see page 11-284).

Go to step 84.

84. Turn the ignition switch OFF.

85. Disconnect the FTP sensor 3P connector, and

measure voltage between body ground and ECM/
PCM connector terminal E5 with the ignition switch
ON (II).

Replace the FTP sensor (see page 11-473).

Go to step 86.

86. Turn the ignition switch OFF.

87. Jump the SCS line with the HDS.

88. Disconnect the FTP sensor 3P connector.

89. Disconnect ECM/PCM connector E (31P).

(cont’d)

Wire side of female terminals

Wire side of female terminals

Wire side of female terminals

Is ther e continuity?

Is ther e about 5 V ?

Is ther e about 5 V ?

05/06/27 17:39:27 61S6M040_110_0271

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YES

NO

11-272

PGM-FI System

MIL Circuit Troubleshooting (cont’d)

ECM/PCM CONNECTOR E (31P)

VCC3 (YEL/BLU)

90. Check for continuity between ECM/PCM connector

terminal E5 and body ground.

Repair short in the wire between the ECM/

PCM (E5) and the FTP sensor.

Update the ECM/PCM if it does not have the

latest software, or substitute a known-good ECM/
PCM (see page 11-6), then recheck. If the symptom/
indication goes away with a known-good ECM/PCM,
replace the original ECM/PCM (see page 11-284).

Wire side of female terminals

Is ther e continuity?

05/06/27 17:39:27 61S6M040_110_0272

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2002-2004 models

YES

NO

YES

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YES

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YES

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11-273

DLC Circuit Troubleshooting

DATA LINK CONNECTOR (DLC)

B

(WHT/RED)

DATA LINK CONNECTOR (DLC)

GND (BLK)

B (WHT/RED)

DATA LINK CONNECTOR (DLC)

LG3 (BRN/YEL)

B (WHT/RED)

DATA LINK CONNECTOR (DLC)

K-LINE
(LT BLU)

LG3
(BRN/YEL)

If the ECM/PCM does not communicate with a scan tool,
HDS, or I/M test equipment, do this troubleshooting
procedure.

1. Measure voltage between DLC terminal No. 16 and

body ground.

Go to step 2.

Repair open in the wire between DLC terminal

No. 16 and the No. 9 BACK UP (7.5 A) fuse in the
under-hood fuse/relay box.

2. Measure voltage between DLC terminals No. 4 and

No. 16.

Go to step 3.

Repair open in the wire between DLC terminal

No. 4 and body ground (G401).

3. Measure voltage between DLC terminals No. 5 and

No. 16.

Go to step 4.

Repair open in the wire between DLC terminal

No. 5 and ECM/PCM (E3) or ECM/PCM (A23, A24)
and body ground.

4. Turn the ignition switch ON (II).

5. Measure voltage between DLC terminals No. 5 and

No. 7.

Go to step 10.

Go to step 6.

6. Turn the ignition switch OFF.

(cont’d)

Terminal side of female terminals

Terminal side of female terminals

Terminal side of female terminals

Terminal side of female terminals

Is ther e batter y voltage?

Is ther e batter y voltage?

Is ther e batter y voltage?

Is ther e 8.5 V or mor e?

05/06/27 17:39:27 61S6M040_110_0273