Component Inspection

P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance

Inspection/Repair - Component Inspection

Component Inspection

1. Check TPS resistance
(1) IG "OFF".
(2) Disconnect TPS connector.
(3) Measure the resistance between terminal 2 and 3 of TPS component side.
A. Specification :









(4) Is the measured resistance within specification?
YES
1) Go to "Check ECM" as follows
NO
1) Substitute with a known-good TPS and check for proper operation.
If the problem is corrected, replace TPS and then go to "Verification of Vehicle.
2. Check ECM
(1) Key "OFF".
(2) Connect the scantool and select "Simulation SCAN" in the menu.
(3) Connect channel A of scantool with terminal 1 of TPS harness connector, and key "ON".
(4) Simulate voltage at signal line.




(5) Does the signal output of TPS change according to simulation voltage?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion,contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO
1) Substitute with a known - good ECM and check for proper operation.
If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.

CAUTION:
There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.
Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others