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Hard Trouble Code E22: Notes

NOTE: If this code is not displayed during second pass of diagnostic codes, it is an intermittent failure and cannot be diagnosed using this procedure.

The ECM supplies 5 volt signal to pin C (circuit No. 474) of TPS and supplies ground path to pin B (circuit No. 476A). TPS signal from pin A (circuit No. 417) is a variable voltage which is dependent on throttle position.

Trouble code indicates that voltage signal from TPS is too low. This can be observed on engine data parameter P.0.1 as reading of B10 to B6° at part throttle. Possible causes are: Defective TPS, defective wiring, terminals, etc., or ECM unable to process signals properly.

NOTE: The following step numbers refer to the numbers in the accompanying flow chart(s).
  1. If opposite condition (high TPS signal) can be created, then self-diagnostics can be used to detect failure by displaying engine data parameter P.0.1. With opposite condition created, parameter reading of 87-90° should be displayed. To create high sensor signal, while back probing, jumper TPS terminal A (Blue wire/circuit No. 417) to terminal C (Gray wire/circuit No. 474) and note parameter value. If reading is now 87-90°, fault must be improper mating of sensor terminals or a faulty TPS.
  2. If reading is 86° or less, measure voltage at TPS test point terminal C (Gray wire/circuit No. 474). If voltmeter reads 0 volts, then TPS is not receiving 5 volts and circuit No. 474 must be repaired for open or short to ground.
  3. If voltmeter reads 5 volts, measure voltage at 3-terminal TPS test point between terminal C (circuit No. 474/Gray wire) and terminal A (circuit No. 417/Blue wire). If voltage is 5 volts, check circuit No. 417 for a short to ground. If wiring is okay, then fault must be in ECM connector or ECM itself.
  4. If voltmeter does not read 5 volts, then an open must exist in either wiring harness or ECM. If data parameter P.0.1 is still 86° or less with pin 11 (circuit No. 474/Gray wire) and pin 5 (circuit No. 417/Blue wire) jumpered together at ECM, fault must be in ECM connector or ECM itself. If reading is 87-90°, then circuit No. 417 is open.
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