PGM-FI System

DTC Troubleshooting (cont'd)

11-260  

  1. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

PROBLEM CYLINDER

DTC

ECM/PCM TERMINAL

WIRE COLOUR

No. 1

DTC 71

A30

YEL/GRN

No. 2

DTC 72

A29

BLU/RED

No. 3

DTC 73

A28

WHT/BLU

No. 4

DTC 74

A27

BRN


Is there continuity?

YES

- Repair short in the wire between the ECM/PCM and the ignition coil.

NO

- Go to step 27.


  1. Connect the appropriate ignition coil 3P connector terminal No. 1 and body ground with a jumper wire (see table).

IGNITION COIL 3P CONNECTOR

Wire side of female terminals

PROBLEM CYLINDER

DTC

WIRE COLOUR

No. 1

DTC 71

YEL/GRN

No. 2

DTC 72

BLU/RED

No. 3

DTC 73

WHT/BLU

No. 4

DTC 74

BRN


  1. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table).

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

PROBLEM CYLINDER

DTC

ECM/PCM TERMINAL

WIRE COLOUR

No. 1

DTC 71

A30

YEL/GRN

No. 2

DTC 72

A29

BLU/RED

No. 3

DTC 73

A28

WHT/BLU

No. 4

DTC 74

A27

BRN


Is there continuity?

YES

- Go to step 29.

NO

- Repair open in the wire between the ECM/PCM and the ignition coil.


  1. Check the engine compression.

Is the engine compression OK?

YES

- Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.

NO

- Repair the engine.


  1. Turn the ignition switch OFF, and disconnect ECM/PCM connector B (24P).
  2. Turn the ignition switch ON (II).