Grand AM L4-138 2.3L VIN A FI HP (1989)
CHART C-8D
Test Description:
Numbers below refer to circled numbers on the diagnostic chart.
1.
Step one checks for an open or grounded circuit between transmission connector and ECM. Since the ECM terminals are normally high, B+
should be indicated at both terminals with the connector removed. A DVM must be used for this step.
2.
A test light to B+ is used in this step to check transmission switches for the normal state. This is 1st gear (or P/N) state. The light should be "ON"
for the N.C. 2nd gear switch. Use of the wiring probe kit J 35616 will assist in this and step 3.
3.
The third step checks to see if the transmission switches function normally. In third gear both switches should have changed from their original 1st
gear state.
Diagnostic Aids:
A sticky or improperly functioning 2nd or 3rd gear switch may cause Code 26 to set intermittently.
