Component Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

PNP Switch Test (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 Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement .
Ignition OFF. Disconnect the harness connector from the park/neutral switch.
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 Ω between the ground terminal 7 and the signal terminal 3.
- P
- N
- If greater than the specified range, replace the PNP switch.

Relay Test

Ignition OFF, disconnect the STRTR relay.
Test for 60-180 Ω 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 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 Ω between terminals 30 and 87.
- If greater than specified range, replace the relay.