General information
- Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
- ECM operates in backup mode if sensors fail , to enable vehicle to be driven to repair shop.
- 1992-95: Trouble codes can be displayed by the MIL or by using a Scan Tool connected to the data link connector (DLC).
- 1996-97: Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC).
Accessing
- Switch ignition ON .
- Jump data link connector (DLC) terminals E1 and TE1 [1].
- Count MIL flashes. Note trouble codes. Compare with trouble code table.
- Each trouble code consists of two groups of one or more flashes [2] A, displayed as follows:
o The first group of flashes indicate the ‘tens’ of the trouble code.
o The second group of flashes indicate the ‘units’ of the trouble code.
o A short pause separates ‘tens’ and ‘units’ [2] B.
o A long pause separates each trouble code [2] C.
o For example: Trouble code 21 displayed [2].
• Each trouble code will be displayed three times in ascending order, followed by the MIL flashing ON-OFF continuously.
• If no trouble codes are stored the MIL will either:
o Flash trouble code 51 then flash ON-OFF continuously, indicating correct functioning of diagnostic system.
o Flash ON-OFF continuously without flashing code 51, indicating a malfunction with either the Idle switch, NC switch or the park/neutral circuits.
• Trouble codes can also be displayed by using a Scan Tool connected to the data link connector (DLC) [1].
1993-95 -normal mode
- Switch ignition ON.
- Jump data link connector (DLC) terminals E1 and TE1 [3]
- Count MIL flashes. Note trouble codes. Compare with trouble code table.
- Each trouble code consists of two groups of one or more flashes [2] [A].
o The first group of flashes indicate the ‘tens’ of the trouble code.
o The second group of flashes indicate the ‘units’ of the trouble code.
o A short pause separates ‘tens’ and ‘units’ [2] [B].
o A long pause separates each trouble code [2] [C].
o For example: Trouble code 21 displayed [2].
- Trouble codes will be displayed in ascending order.
- If no trouble codes are stored the MIL will flash ON-OFF continuously.
- Remove jump lead.
- Switch ignition OFF.
- Rectify faults as necessary.
- Trouble codes can also be displayed by using a Scan Tool connected to the data link connector (DLC) [3]
1993-95 -test mode
- Switch ignition OFF.
- Jump data link connector (DLC) terminals E1 and TE2 [3]
- Switch ignition ON .
- Ensure malfunction indicator lamp (MIL) flashes ON-OFF continuously.
- Start engine.
- Drive vehicle at over 6 mph to meet conditions of customer complaint.
- Stop vehicle. Do not switch ignition OFF.
- With data link connector (DLC) terminals E1 and TE2 jumped, jump terminals E1 and TE1 [3]
- Count MIL flashes. Note trouble codes. Compare with trouble code table.
- Switch ignition OFF.
- Remove jump leads.
- Rectify faults as necessary.
NOTE: Codes 42 and 43 may be produced if this procedure is NOT carried out correctly. Code 51 will be produced during this procedure and can be ignored.1996-97
• Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC) [4].
Erasing
Method 1 -1992
- Ensure ignition switched OFF.
- Remove STOP fuse (15A) from LH kick panel fuse box for at least 30 seconds [5].
- Reinstall fuse.
- Repeat accessing procedure to ensure no trouble codes remain in ECM fault memory.
- Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC).
Method 1 -1993-97
- Ensure ignition switched OFF.
- Remove EFI F-HTR fuse (15A) from engine bay fuse box for at least 30 seconds [6]
- Reinstall fuse.
- Repeat accessing procedure to ensure no trouble codes remain in ECM fault memory.
- Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC).
Method 2
NOTE: Disconnecting battery ground lead may cause driveability problems until the engine management system relearns basic values.- Ensure ignition switched OFF.
- Disconnect battery ground cable for at least 30 seconds.
- Reconnect battery ground cable.
- Repeat accessing procedure to ensure no trouble codes remain in ECM fault memory.
- Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC).
NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio.Trouble code identification
