CODE 35 XX -- POWER INTERRUPTION

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 35 XX -- POWER INTERRUPTION (Figure 513)

Main code 35 indicates the ECU has detected a complete power loss before the ignition was turned off or before

ECU shutdown is completed. When this happens, the ECU is not able to save the current operating parameters in

memory before turning itself off.

Main

Code

Subcode

Meaning

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.

Real-time write interruption. (Power interruption at the same time the ECU is

recording a critical code to the real-time section.)

Active Indicator Clearing Procedure:

Power down

Manual -- except code 35 16

NOTE:

Before troubleshooting, read Paragraph 56. 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. Turning the

master switch off before ECU shutdown is completed will also cause this code. No troubleshoot-

ing 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 36 indicates the system has detected a mismatch between the ECU hardware and the ECU software or

that there is a TransID (TID) problem.

Main

Code

Subcode

Meaning

Mismatch between ECU hardware and software

TransID not compatible with hardware/software

TransID did not complete

Active Indicator Clearing Procedure:

Power down

0021 0081