Copyright © 1998 General Motors Corp. 6–59
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Main code 35 indicates the ECU has detected a complete power loss before the ignition was turned off. When this
happens, the ECU is not able to save the current operating parameters in memory before turning itself off.
Active Indicator Clearing Procedure:
•
Power down
•
Manual — except Code 35 16
NOTE: Before troubleshooting, read Pages 6–17 and 6–18 of Section 6–5. Also, check battery and ECU input
voltages.
Troubleshooting:
1. If the vehicle has a master switch controlling battery power to the ECU and an ignition switch,
turning the master switch off before turning the ignition switch off can cause this code. No
troubleshooting is necessary.
2. If improper switch sequencing is not the cause, check ECU power and ground for opens, shorts,
and shorts-to-ground. Not using battery-direct power and battery ground connections can cause
this code. A defective charging system, or open battery fuse or fusible link can also cause this
code. The battery fuse or fusible link may be at the battery or in the VIM. Dirty, corroded, or
painted power and ground connections can also cause this code.
3. If all system power and ground connections are satisfactory and the problem persists, replace the
ECU. If replacing the ECU corrects the problem, reinstall the original (bad) ECU to confirm that
the problem is in the ECU. If the original ECU now works, inspect the ECU connectors for any
corrosion or damage which may cause an intermittent condition. If the original problem reoccurs,
reinstall the replacement ECU.
Main
Code
Subcode Meaning
35 00
Power interruption. (Not an active code; only appears after power is restored.)
During power interruption, DNS light is not illuminated and the transmission
will not shift.
35 16
Real-time EEPROM write interruption. (Power interruption at the same time
the ECU is recording a critical code to the real-time section of the EEPROM.)
CODE 35 XX — POWER INTERRUPTION
(Figure 6–20)
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