WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
6–14 Copyright © 1998 General Motors Corp.
DIAGNOSTIC CODES
69
(cont’d)
22 ECU, G solenoid driver open Yes
DNS, SOL OFF
(Hydraulic default), DNA
23 ECU, H solenoid driver open No Retarder allowed, DNA
24 ECU, J solenoid driver open No Low and 1st inhibited, DNA
25 ECU, K solenoid driver open No Retarder operation inhibited, DNA
26 ECU, N solenoid driver open No Low and 1st inhibited, DNA
32
ECU, SPI communications link
fault
No
Induce COP timeout (reset ECU),
DNA
33
ECU, Computer Operating
Properly (COP) timeout
No
(5)
Reset ECU, Shutdown ECU on 2nd
occurrence. This code may cause
“cateyes” or all segments blank,
DNA
34 ECU, EEPROM write timeout Yes
DNS, SOL OFF
(Hydraulic default), DNA
35 ECU, EEPROM checksum test No
(5)
Induce COP timeout (reset ECU),
DNA
36 ECU, RAM self test No
(5)
Induce COP timeout (reset ECU),
DNA
41 ECU, I/O ASIC addressing test No
(5)
Induce COP timeout (reset ECU),
DNA
NOTES
(1)
This code is logged to real time to protect the transmission in case a loss of power to the ECU
(Power Interruption, Code 35 00) occurs.
(2)
The factory calibration must be rewritten to the ECU, or a different factory calibration is required to match
the software in the ECU.
(3)
The ECU hardware or software must be changed so that they are compatible.
(4)
Additional codes could be logged for other shifts where X indicates range shifted from and Y indicates range
shifted to.
(5)
The COP reset will clear the active inhibit.
Table 6–2. WT Series Diagnostic Codes (cont’d)
Main
Code
Subcode Description
DO NOT
SHIFT
Light
Inhibited Operation
Description
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