GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Place the transmission in park (A/T) or actuate the clutch pedal (M/T).
  2. Move the ignition switch to the START position.
  3. Measure the voltage between the starter solenoid terminal S, CKT 6 (PPL) and an engine ground.

Is the voltage reading the same as the battery voltage?

--

Go to Step 13

Go to Step 2

2

  1. Remove the starter relay from the underhood fuse block.
  2. Connect a test lamp from the starter relay socket cavity 30 to ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 14

3

Connect a jumper wire between cavity 30 and 87 of the starter relay socket.

Does the starter solenoid click?

--

Go to Step 4

Go to Step 15

4

  1. Connect CKT 6 (PPL) at the starter solenoid.
  2. Connect a test lamp between starter relay socket cavity 85 to B+.

Does the test lamp light?

--

Go to Step 5

Go to Step 16

5

  1. Place the transmission in park (A/T) or actuate the clutch pedal (M/T).
  2. Move the ignition switch to the START position.
  3. Measure the voltage between the starter relay socket cavity 86 and 85.

Is the voltage reading the same as the battery voltage?

--

Go to Step 17

Go to Step 6

6

Is the vehicle equipped with a manual transmission?

--

Go to Step 7

Go to Step 9

7

  1. Disconnect the clutch pedal position switch connector.
  2. Move the ignition switch to the START position.
  3. Measure the voltage between the clutch pedal position switch connector cavity A, CKT 806 (PPL), to ground.

Is the voltage reading the same as the battery voltage?

--

Go to Step 8

Go to Step 11

8

  1. Engage the parking brake.
  2. Actuate the clutch pedal and place the transmission in neutral.
  3. Connect a fused jumper between the clutch pedal position switch connector cavity A, CKT 806 (PPL), to cavity C, CKT 1035 (PPL/WHT).
  4. Move the ignition switch to the START position.

Does the engine crank?

--

Go to Step 18

Go to Step 19

9

  1. Disconnect the transmission range switch connector.
  2. Move the ignition switch to the START position.
  3. Measure the voltage between the transmission range switch connector C1 cavity E, CKT 806 (PPL), to ground.

Is the voltage reading the same as the battery voltage?

--

Go to Step 10

Go to Step 11

10

  1. Connect a fused jumper between transmission range switch connector C1 cavity E, CKT 806 (PPL), to cavity G, CKT 1035 (PPL/WHT).
  2. Move the ignition switch to the START position.

Does the engine crank?

--

Go to Step 20

Go to Step 21

11

  1. Move the ignition switch to the START position.
  2. Measure the voltage between the ignition switch connector C266 cavity D1, CKT 5 (YEL), to ground.

Is the voltage reading the same as the battery voltage?

--

Go to Step 22

Go to Step 12

12

Measure the voltage between the connector C266 cavity D5 and ground.

Is the voltage reading the same as the battery voltage?

--

Go to Step 23

Go to Step 24

13

  1. Clean the starter motor, the starter motor mounting surfaces, and the mounting bolts. Refer to Starter Motor Inspection .
  2. Repeat the test.

If the starter motor does not pass the test, replace the starter motor.

Is the repair or replacement complete?

--

Go to Starting System Check

--

14

Install the starter relay and repair the open in CKT 244 (RED) between fuse 6 and the starter relay. Refer to Wiring Repairs

Is the repair complete?

--

Go to Starting System Check

--

15

Install the starter relay and repair the open in CKT 6 (PPL) between the starter relay and the starter solenoid. Refer to Wiring Repairs

Is the repair complete?

--

Go to Starting System Check

--

16

Install the starter relay and repair the open in CKT 150 (BLK) between the starter relay and ground G105. Refer to Wiring Repairs

Is the repair complete?

--

Go to Starting System Check

--

17

Replace the starter relay.

Is the replacement complete?

--

Go to Starting System Check

--

18

  1. Adjust the clutch pedal position switch.
  2. Retest the system.
  3. If the starter motor does not operate, replace the clutch pedal position switch. Refer to Clutch Pedal Engine Start Switch Replacement .

Is the repair or replacement complete?

--

Go to Starting System Check

--

19

Repair the open in CKT 1035 (PPL) between the clutch pedal position switch and the starter relay. Refer to Wiring Repairs

Is the repair complete?

Go to Starting System Check

--

20

Replace the transmission range switch. Refer to Park/Neutral Back Up Switch Replacement .

Is the replacement complete?

--

Go to Starting System Check

--

21

Repair the open in CKT 5 (YEL) between the transmission range switch and the starter relay. Refer to Wiring Repairs

Is the repair complete?

--

Go to Starting System Check

--

22

  1. Check for an open in CKT 5 (YEL) between the ignition switch and the IP fuse block.
  2. If OK, repair the open in CKT 806 (PPL) between the IP fuse block and the clutch pedal position switch (M/T) or the transmission range switch (A/T). Refer to Wiring Repairs

Is the repair or replacement complete?

--

Go to Starting System Check

--

23

Replace the ignition switch. Refer to Ignition Lock Cylinder Replacement - On Vehicle .

Is the replacement complete?

--

Go to Starting System Check

--

24

Repair the open in CKT 242 (RED) between the ignition switch and the underhood fuse block. Refer to Wiring Repairs

Is the replacement complete?

--

Go to Starting System Check

--