PCC1302 Engine Power Loss of Speed Sense Shutdown Code 121 Solution

Here is a instruction show the step on how to diagnostics and repair PCC1302 engine power generation fault code 121 loss of speed sense shutdown trouble.

 

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Logic:
No engine speed signal detected from one of two signals: engine crankshaft speed or engine
camshaft position.

Possible Causes:
1.Faulty crankshaft speed sensor connections
2.Faulty crankshaft speed sensor
3.Faulty camshaft position sensor connections
4.Faulty camshaft position sensor
5.Faulty engine harness
6.Faulty extension harness
7.Damaged crankshaft target wheel
8.Verify the calibrations in the ECM and the PowerCommand controls

Diagnosis and Repair:
1.Faulty crankshaft speed sensor connections
a.Inspect the crankshaft speed sensor and the engine harness connector pins.
a.Disconnect the engine harness connector from the crankshaft speed sensor.
b.Inspect for corroded, bent broken, pushed back, expanded, or loose pins.
c.Inspect for evidence of moisture in or on the connector.

d.Inspect for missing or damaged connector seals.
e.Inspect for dirt or debris in or on the connector pins.

2.Faulty crankshaft speed sensor
a.Check the crankshaft speed sensor supply voltage.
a.Disconnect the engine harness connector from the crankshaft speed sensor.
b.Install the speed sensor breakout cable between the sensor and the sensor harness connector.
c.Measure the supply voltage by connecting the breakout cable

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