STEP/SEQUENCE RESULT WHAT TO DO NEXT TM 9-2320-363-20-1 Section 4 TROUBLESHOOTING CHARTS E. FLASH CODE: 21 J1587 CODE: P91 3 - ELECTRONIC FOOT PEDAL ASM (EFPA) CIRCUIT FAILED HIGH (VOLTAGE HIGH) ALSO CALLED THROTTLE POSITION SENSOR (TPS) 21-5 Attempt TPS Adjustment Check for pedal or linkage Corrected Go to 21-30. interferences. If linkages appear problem so that Throttle okay, loosen the TPS screws and Counts is now correct. attempt to adjust for the correct no throttle reading (48-144) counts). Could not Go to 21-6. (NOTE: Newer version pedals are correct the problem. non-adjustable.) Do not attempt to adjust by bending the pedal mechanism. 21-6 Check TPS Connectors Inspect terminals at the TPS Terminals and Replace TPS. Then go to connectors (sensor side and connectors are okay. 21-30. harness side) for damage; bent, corroded, and unseated pins of Problem found. Repair terminals/connectors. sockets. Then go to 21-30. 21.7 Check for Short Turn Ignition off. Less than or Signal line (ckt#417) is shorted Disconnect the vehicle harness , equal to 10,000 ohms. to the vehicle + 5 Volt line (ckt connector at the ECM. #916). Repair short Then go to Read resistance between sockets 21-30. D2 and A3 on the vehicle harness connector.   Greater then Go to 21-8. 10,000 ohms or open. 21-8 Check for Short to Battery + Remove both fuses to the ECM. All readings are Go to 21-9. Disconnect the vehicle harness greater than 10,000 ohms. and 5-way power harness or open. connectors at the ECM. Read resistance between socket Any reading is A short exists between the D2 of the vehicle harness less than or equal to sockets where less than 10,000 connector and socket B3 of the 10,000 ohms. ohms resistance was read. vehicle harness connector. Repair short and reinsert fuses Also read resistance between (or reset breakers). Then go to socket D2 on the vehicle harness 21-30. connector and the following sockets on the 5-way power harness connector: A and C. Change 3  3-345.233