## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-532

11. Turn the ignition switch OFF.

12. Disconnect the knock sensor 3P connector.
13. Turn the ignition switch ON (II).
14. Measure voltage between knock sensor 3P connector terminal No. 1 and body ground.

KNOCK SENSOR 3P CONNECTOR

Wire side of female terminals

Is there about 5 V?

YES | - Go to step 19.
NO | - Go to step 15.

15. Measure voltage between ECM/PCM connector terminal A9 and body ground.

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

Is there about 5 V?

YES | - Repair open in the wire between the ECM/PCM (A9) and knock sensor.
NO | - Go to step 16.

16. Turn the ignition switch OFF.

17. Disconnect ECM/PCM connector A (31P).
18. Check for continuity between ECM/PCM connector terminal A9 and body ground.

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

Is there about 5 V?

YES | - Repair short in the wire between ECM/PCM (A9) and the knock sensor.
NO | - Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.

19. Substitute a known-good knock sensor and recheck.

Is the MIL on and does it indicated DTC 23?

YES | - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.
NO | - Replace the original knock sensor.