Diagnostic Aids

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.

Check for a skewed MAP signal or faulty sensor. An incorrect MAP signal may cause PCM to incorrectly calculate predicted TP sensor value during high engine load situations. Check for an unusually low MAP reading.

Check for poor connection at PCM. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal connection. Inspect wiring harness for damage. If connections and harness appear okay, observe TP and MAP displays on scan tool while moving all related harnesses and connectors. A change in scan tool display may indicate a fault. Check for MAP signal out of range or faulty MAP sensor by comparing scan tool values of a known-good similar vehicle. If DTC cannot be duplicated, FAILURE RECORDS data can be used in determining vehicle mileage since DTC was last set. If it is determined that DTC occurs intermittently, performing DTC P1121: THROTTLE POSITION SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE or DTC P1122: THROTTLE POSITION SENSOR CIRCUIT INTERMITTENT LOW VOLTAGE may isolate cause of fault.