Honda >> Passport 3.2L (1996 – 2002)

Model Year Engine identification System
Passport 3.2L 1996-02 6VD1 Isuzu MFI

General information

  • Engine control module (ECM) incorporates self-diagnosis function.
  • Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to workshop.


  • Trouble codes can be displayed by using a Scan Tool connected to the data link connector (DLC) 1 under the LH fascia.


  • After the faults have been rectified, trouble codes can be erased by using a Scan Tool connected to the data link connector (DLC) 1 or as follows:
  • Switch ignition OFF.
  • Disconnect battery ground cable for 30 seconds minimum.
  • Reconnect battery ground cable.
  • Repeat checking procedure to ensure no data remains in ECM fault memory.

NOTE: Disconnecting battery ground lead will also erase trouble codes but may erase memory from electronic units such as radio.

Trouble code  identification

OBD·II code Fault location Probable cause
PO,P2, UO Refer to OBD-11 trouble code tables
P1106 Manifold absolute pressure (MAP) sensor – circuit/intermittent voltage high Wiring, MAP sensor
P1107 Manifold absolute pressure (MAP) sensor – circuit/ intermittent voltage low Wiring, MAP sensor
P1111 Intake air temperature (IAT) sensor- circuit/   intermittent voltage high Wiring, IAT sensor
P1112 Intake air temperature (IAT) sensor- circuit!   intermittent voltage low Wiring, IAT sensor
P1114 Engine coolant temperature (ECT) sensor – circuit/intermittent voltage low Wiring, ECT sensor
P1115 Engine coolant temperature (ECT) sensor – circuit/intermittent voltage high Wiring, ECT sensor
P1120 Throttle motor position sensor 1 – circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, throttle control unit, ECM
P1121 Throttle position (TP) sensor- circuit!   intermittent voltage high Wiring, TP sensor
P1122 Throttle position (TP) sensor- circuit!   intermittent voltage low Wiring, TP sensor
P1125 Throttle position (TP) motor- fail safe mode Wiring, TP sensor, TP motor, mechanical fault, ECM
P1133 Heated oxygen sensor (H02S) – RH front- insufficient switching Exhaust system, wiring, H02S, ECM
P1134 Heated oxygen sensor (H02S) – RH front – slow operation Exhaust system, wiring, H02S, ECM
P1153 Heated oxygen sensor (H02S) – LH front – insufficient switching Exhaust system, wiring, H02S, ECM
P1154 Heated oxygen sensor (H02S) – LH front – slow operation Exhaust system, wiring, H02S, ECM
P1167 Fuel trim, bank 1 – mixture too rich during deceleration Injectors, fuel pump, fuel pressure, ECM
P1169 Fuel trim, bank 2 – mixture too rich during deceleration Injectors, fuel pump, fuel pressure, ECM
P1171 Fuel system – mixture lean under acceleration Fuel pump/strainer, incorrect fuel
P1220 Throttle motor position sensor 2 – circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, throttle control unit, ECM
P1221 Throttle motor position sensor 1/2- signal variation Wiring, throttle control unit, ECM
P1271 Accelerator pedal position (APP) sensor 1/2- signal variation Wiring, APP sensor, ECM
P1272 Accelerator pedal position (APP) sensor 2/3 – signal variation Wiring, APP sensor, ECM
P1273 Accelerator pedal position (APP) sensor 1/3- signal variation Wiring, APP sensor, ECM
P1275 Accelerator pedal position (APP) sensor 1 – circuit malfunction Wiring open circuit/short circuit to ground/   short circuit to positive, APP sensor, ECM
P1280 Accelerator pedal position (APP) sensor 2 – circuit malfunction Wiring open circuit/short circuit to ground/   short circuit to positive, APP sensor, ECM
P1285 Accelerator pedal position (APP) sensor 3 – circuit malfunction Wiring, APP sensor, ECM·
P1290 Throttle position (TP) motor -forced idle mode Wiring, APP sensor, TP motor, mechanical fault, ECM
P1295 Throttle position (TP) motor – power management mode Wiring, TP sensor, TP motor, MAP sensor, MAF sensor, ECM
P1299 Throttle position (TP) motor – forced engine shut down mode Wiring, TP sensor, TP motor, MAP sensor, MAF sensor, ECM
P1310 Ignition control module (ICM) – diagnosis Wiring, ignition coil(s), ICM, ECM
P1311 Ignition control module (ICM) – ignition·coil secondary coil signal, circuit 1   Wiring, ignition coil(s), ICM, ECM
P1312 Ignition control module (ICM) – ignition coil secondary coil signal, circuit 2 Wiring, ignition coil{s), ICM, ECM
P1326 Ignition control module (ICM) – combustion quality input signal Wiring, ignition coil(s), ICM, ECM
P1340 Ignition control module (ICM) – cylinder identification/syncronization Wiring, ignition coil(s), ICM, ECM
P1380 Engine control module (ECM)/ABS control module, rough road signal – communication fault Wiring, ABS trouble code(s) stored, ECM
P1381 Engine control module (ECM)/ABS control module – communication fault Wiring, ABS trouble code(s) stored, ECM
P1390 G-force sensor – intermittent voltage low Wiring, G-force sensor
P1391 G-force sensor – performance Seal damaged/missing, incorrectly installed, wiring, G-force sensor, ECM
P1392 G-force sensor – voltage low Wiring, G-force sensor, ECM
P1393 G-force sensor – voltage high Wiring, G-force sensor, ECM
P1394 G-force sensor – intermittent voltage high Wiring, G-force sensor
P1404 Exhaust gas recirculation (EGR) valve – valve closed Wiring, EGR valve
P1406 Exhaust gas recirculation (EGR) valve position sensor – circuit problem Wiring, EGR valve/position sensor, ECM
P1441 Evaporative emission (EVAP) canister purge system – flow detected Wiring, EVAP solenoid, ECM
P1508 Idle air control (lAC) system – low RPM Intake system, throttle body, hose leak, wiring, lAC valve, ECM
P1509 Idle air control (lAC) system – high RPM Hose leak, throttle body, crankcase vent valve, wiring, lAC valve, ECM
P1514 Throttle position (TP) sensor/mass air flow   (MAF) sensor – signal variation Wiring, TP sensor, MAP sensor, ECM
P1515 Throttle command/actual throttle position – signal variation Wiring, throttle valve sticking, throttle control unit, ECM
P1516 Throttle position motor – position performance Throttle valve tight/sticking, TP sensor, wiring, throttle control unit, ECM
P1523 Throttle position motor – closed position performance Throttle valve tight/sticking, TP sensor, wiring open circuit/short circuit to ground, throttle control unit, ECM
P1571 Brake pedal position (BPP) switch – no operation Wiring, BPP switch
P1618 Engine control module (ECM) – internal fault ECM
P1625 Engine control module (ECM) – unexpected reset Interference from non standard electronics, erase trouble code and re-test
P1635 Sensor supply voltage – circuit 1 malfunction Wiring short circuit to ground/positive, ground wiring open circuit, ECM
P1639 Sensor supply voltage – circuit 2 malfunction Wiring short circuit to ground/positive, ground wiring open circuit, throttle position (TP) sensor, ECM
P1640 Engine control module (ECM), output driver – internal fault Wiring, ECM
P1646 Sensor supply voltage – circuit C malfunction Wiring short circuit to ground/positive, ground wiring open circuit, accelerator pedal position (APP) sensor, ECM
P1650 Engine control module quad driver/output driver Wiring, evaporative emission (EVAP) canister purge valve, intake manifold air control solenoid, ECM
P1790 Engine control module (ECM) – AT ROM   checksum error ECM/programming
P1792 AT -AT EEPROM checksum error ECM/programming
P1835 AT – kick-down switch Wiring, kick-down switch, ECM
P1850 AT – brake band solenoid malfunction AT trouble code(s) stored
P1860 AT- torque converter clutch (TCC) solenoid circuit Wiring, TCC solenoid, ECM
P1870 AT – component slipping Range switch, mechanical failure, engine speed signal incorrect