Component Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

PNP Switch (M30 4L60E, M70 4L70E)

Inspect the range selector lever cable for proper adjustment. Refer to Range Selector Lever Cable Adjustment .
Inspect the park/neutral position switch for proper adjustment. Refer to Park/Neutral Position Switch Adjustment .
Ignition OFF. Disconnect the harness connector from the park/neutral switch. Refer to Park/Neutral Position Switch Replacement .
With the PNP switch in the following positions, test for infinite resistance between the ground terminal 7 and the signal terminal 3.
- R
- OD
- D
- 2
- 1
- If not the specified value, replace the PNP switch.
With the PNP switch in the following positions, test for less than 2.0 ohms between the ground terminal 7 and the signal terminal 3.
- P
- N
- If greater than the specified range, replace the PNP switch.

STRTR Relay

Ignition OFF, remove the STRTR relay. Refer to Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center) .
Test for 60-180 ohms between terminals 85 and 86.
- If not within the specified range, replace the relay.
Test for infinite resistance between the following terminals:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If not the specified value, replace the relay.
Install a 20 amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2.0 ohms between terminals 30 and 87.
- If greater than specified range, replace the relay.