98 Amigo 2.2l ECM?

SCROMPY

MEMBER
1998 ISUZU AMIGO
4 CYL
2WD
MANUAL
70,000 MILES

I have a 98 Amigo 2.2l. The electric fan will not come on til the engine coolant temp gauge is almost all the way hot. All sensors have been replaced. I took it for diagnostic and all connections, relays and fuses check out good. The diagnostic tool could not recognize the ECM or PCM. I also noted that when I turn the key on the check engine light or oil light does not light up. Mechanic said replace ECM. I replaced with one out of 99 2.2l still gets hot lights still does not come on and gas gauge stuck to over full. My question is are the ECM/PCM enterchangeable (from 98-99). Is there a reset procedure I need to follow? Or any other advice other than straight wire the fan and hope for the best. Thanks so much!

2 Replies

KHLOW2008

MECHANIC
41,814 POSTS

When the MIL and oil pressure indicator light does not come on, you need to check for fault. It could be a broken wire somewhere and when this occurs, the scan tool would not be able to communicate with the ECM.

98 or 99 they should be interchangeable as long as the part number are the same.

Straight wiring the fan is not going to be the solution as there could be some latent problem that might surface later on if the source of the problem is not rectified.

MALFUNCTION INDICATOR LIGHT (MIL) INOPERATIVE

1. Perform On-Board Diagnostic II (OBD-II) System Check. After performing OBD-II system check, go to next step.

2. Attempt to start engine. If engine does not start, go to step 6). If engine starts, go to next step.

3. Check METER fuse (15-amp) located in underhood fuse box. If fuse is okay, go to next step. If fuse is blown, go to step 16).

4. Turn ignition on. Using test light connected to ground, probe ignition feed circuit at instrument cluster terminal No. 9 (Yellow wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 13).

5. Turn ignition off. Disconnect PCM electrical connectors. Connect a jumper wire between ground and MIL control circuit at PCM 36-pin, Red connector terminal A13 (White/Green wire). Turn ignition on. If MIL comes on, go to step 10). If MIL does not come on, go to step 11).

6. Check ENGINE fuse (15-amp) located in dash fuse box. Check PCM fuse EB-12 (15-amp) in fuse/relay box located in engine compartment. If fuses are okay, go to next step. If fuses are blown, go to step 15).

7. Turn ignition off. Disconnect PCM electrical connectors. Turn ignition on. Using test light connected to ground, probe ignition feed circuits at PCM 36-pin, Blue connector terminals E16 and F16 (Red/Blue wires). If test light illuminates, go to next step. If test light does not illuminate, go to step 12).

8. Using test light connected to ground, probe battery feed circuit at PCM 36-pin, Red connector terminal A4 (Red/White wire). If test light does not illuminate, go to step 14). If test light illuminates, go to next step.

9. Check for faulty PCM ground connections. Repair as necessary. Retest system. If connections are okay, go to next step.

10. Check PCM connectors for damaged terminals. If any terminals are damaged, repair terminals as necessary. Retest system. If PCM connector terminals are okay, go to step 17).

11. Check for an open in MIL control circuit (White/Green wire) between PCM and MIL. Repair as necessary. Retest system. If circuit is okay, go to step 18).

12. Substitute PCM main relay with a known-good relay. PCM main relay is located in fuse/relay box in engine compartment. Observe MIL. If MIL operates properly, replace PCM main relay. Retest system. If MIL still does not operate, go to next step.

13. Repair open in ignition feed circuit (Black/Yellow wire) between PCM main relay and dash fuse box. Retest system.

14. Repair open in PCM battery feed circuit (Red/White wire) between PCM and fuse/relay box located in engine compartment. Retest system.

15. Repair short to ground in PCM ignition feed circuit (Black/Yellow or Red/Blue wire) or PCM battery feed circuit (Red/White wire). Retest system. Replace fuse.

16. Repair the short to ground in ignition feed circuit (Yellow wire) between instrument cluster and dash fuse box. Retest system. Replace fuse.

17. Replace PCM. Reprogram PCM. Verify proper system operation. Retest system.

18. Check MIL driver circuit (White/Green wire) for poor connection at instrument cluster connector. Repair as necessary. Retest system. If no problem is found, diagnose problem in instrument cluster.