Acura RL (1996-2004 year). Manual — part 273
PGM-FI System
MIL Circuit Troubleshooting (cont'd)
(From page
Check for an open in the wires
(PG, LG lines):
1. Reconnect the fuel injector
and IAC valve connectors.
2. Measure voltage between
body ground and the PCM
connector terminals A12, A25,
A26, and 69 individually.
Is there less than 1.0 V?
YES
Check for a short in the wires
(VCC1, VCC2 lines):
Measure voltage between body
ground and the PCM connector
terminals DID and 021 individu-
ally.
Is there about 5 V?
NO
YES
Substitute a known-good PCM
and recheck. If symptom/indica-
tion goes away, replace the origi-
nal PCM.
PCM CONNECTOR A (26P)
LG1
(BRN/BLK)
Repair open in the wire(s)
between the PCM and G101 that
had more than 1.0 V.
Check for a short in a sensor:
While measuring voltage between
body ground and the PCM con-
nector terminals D10 and D21
individually, disconnect the 3P
connector of each sensor one at
a time.
— MAP sensor
— TP sensor
— EGR valve lift sensor
— Fuel tank pressure sensor
— VSA control valve angle sensor
Is there about 5 V?
NO
Check for a short in the wires
(VCC1, VCC2 lines):
1. Turn the ignition switch OFF.
2. Disconnect the ECM connec-
tor D (22P).
3. Check for continuity between
body ground and ECM con-
nector terminals D10 and D21
individually.
Is there continuity?
NO
Substitute a known-good PCM
and recheck. If symptom/indica-
tion goes away, replace the origi-
nal PCM.
Wire side of female terminals
Replace the sensor that had
about 5 V.
Repair short in the wire between
the MAP sensor, TP sensor, EGR
valve position sensor, fuel tank
pressure sensor or VSA control
valve angle sensor and PCM.
Main Menu
Table of Contents
Check the Diagnostic Trouble
Code (DTC):
1. Turn the ignition switch OFF.
2. Connect the scan tool or the
HDS.
3. Turn the ignition switch ON (II).
4. Read the DTC with the scan
tool or the HDS.
Are any DTC(s) indicated?
Go to the DTC Troubleshooting
Index (see page
NO
Check for a short in the wire
(SCS line):
1. Turn the ignition switch OFF.
2. Turn the ignition switch ON (II).
3. Measure voltage between
PCM connector terminal C5
and body ground.
PCM CONNECTOR C (12P)
SCS (RED)
Wire side of female terminals
Is there about 5 V (or battery
voltage)?
Repair short in the wire between
the service check connector, data
link connector and PCM (C5).
YES
DATA LINK CONNECTOR (DLC)
Terminal side of female terminals
Is there continuity?
Repair short in the wire between
the DLC and PCM (D4).
NO
(To page
(cont'd)
(From page
Check for a short in the wire
(K-line):
1. Turn the ignition switch OFF.
2. Disconnect the PCM connector
D (22P).
3. Check for continuity between
the Data link connector (DLC)
16P connector terminal No. 7
and body ground.
Main Menu
Table of Contents
(From page
Check for an open in the wire
(K-line):
Check for continuity between the
DLC 16P connector terminal No.7
and PCM connector terminal D4.
Is there continuity?
Repair open in the wire between
the DLC and PCM (D4).
YES
Check for a short in the wire (MIL
line):
Turn the ignition switch ON (II).
Does the MIL come on?
NO
Repair short in the wire between
the gauge assembly and PCM
(A7).
Substitute a known-good PCM
and recheck. If symptom/indica-
tion goes away, replace the origi-
nal PCM.
MIL Circuit Troubleshooting (cont'd)
Main Menu
Table of Contents
Check for an open in the wire or
bulb (MIL line):
1. Turn the ignition switch OFF.
2. Connect PCM connector ter-
minal A7 and body ground
with a jumper wire.
3. Turn the ignition switch ON (II).
Does the MIL come on?
YES
Repair open in the wires
between the PCM (A7) and
gauge assembly.
Replace the MIL bulb.
Substitute a known-good PCM
and recheck. If symptom/indica-
tion goes away, replace the origi-
nal PCM.
(From page
Main Menu
Table of Contents
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