Installation manual

7-13

90-898305

False Throttle Position Sensor Failures

2.5 LITRE

If the Throttle Position Sensors (TPS’s) are out of the intended operating

range, or change value at the idle position, after the engine is started, the

Electronic Control Module (ECM) will sense that the (TPS/s) has failed. The

warning horn will sound, check engine light will illuminate, DDT will indicate

failed TPS/s, and the engine may go into power reduction. If TPS failures

codes occur check the following.

• Check throttle cable adjustment, the throttle stop screw on throttle aria

must be against the throttle stop on the cylinder block when the engine is

started. Pre-load the throttle cable barrel one or two turns if necessary.

• When starting the engine make sure the operator is not pushing on the

throttle (if foot throttle is used) or advance the throttle only on the control

box.

• Check the throttle cam to roller adjustment. If the roller is not down in the

pocket/valley area on the cam, there is a tendency for the roller to ride up

or down on the cam, this in turn causes the TPS link arm to push/pull on

the TPS lever, changing the valve.

• Perform heat test on TPI, replace any units which fail test.

Correct Cam to Roller Setting (2.5L)

Notes

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