Honda >> Pilot 3.5L (2003 – 2004)

Model Year Engine identification System
Pilot 3.5L 2003-04 J35A4 PGM-FI

General information

  • 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 repair shop.


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


  • Trouble codes can only be erased by using a Scan Tool connected to the data link connector (DLC) 1.

Trouble code  identification

Flash code OBD·II code Fault location Probable cause
PO, P2,   uo Refer to OBD-11 trouble code tables
1 Heated oxygen sensor (H02S) – front – circuit/voltage high/low Wiring short/open circuit, H02S, fuel system, ECM
3 Manifold absolute pressure (MAP) sensor – circuit/voltage low/high Wiring, MAP sensor, ECM
4 Crankshaft position (CKP) sensor – circuit malfunction/range/performance problem Wiring, CKP sensor, ECM
5 Manifold absolute pressure (MAP) sensor – range/performance problem Hose leak/blockage, MAP sensor
5 P1128 Manifold absolute pressure (MAP) sensor – pressure lower than expected MAP sensor
5 P1129 Manifold absolute pressure (MAP) sensor – pressure higher than expected MAP sensor
6 Engine coolant temperature (ECT) sensor- circuit/voltage low/high Wiring short/open circuit, ECT sensor, ECM
7 Throttle position (TP) sensor – circuit/   voltage low/high Wiring, TP sensor, ECM
7 P1121 Throttle position (TP) sensor – position lower than expected TP sensor
7 P1122 Throttle position (TP) sensor – position higher than expected TP sensor
8 Camshaft position (CMP) sensor 1 – no signal/intermittent signal Wiring, CMP sensor, ECM
9 Output shaft speed (OSS) sensor – circuit malfunction Wiring, OSS sensor, ECM
10 Intake air temperature (IAT) sensor- circuit/   voltage low/high Wiring short/open circuit, IAT sensor, ECM
12 P1491 Exhaust gas recirculation (EGR) system – valve lift insufficient Wiring, EGR valve/position sensor, EGR solenoid, hose leak/blockage, ECM  
12 P1498 Exhaust gas recirculation (EGR) valve position sensor – voltage high Wiring, EGR valve/position sensor, ECM
13 P1106 Barometric pressure (BARO) sensor- range/performance problem ECM
13 P1107 Barometric pressure (BARO) sensor- circuit/voltage low Wiring, ECM
13 P1108 Barometric pressure (BARO) sensor- circuit/voltage high ECM
14 Idle control system – malfunction lAC valve, fast idle thermo valve, throttle body
14 P1519 Idle air control (lAC) valve – circuit malfunction Wiring, lAC valve, ECM
15 Turbine shaft speed (TSS) sensor- circuit malfunction Wiring, TSS sensor, ECM
20 P1297 Electrical load sensor – circuit/voltage low Wiring, electrical load sensor, ECM
20 P1298 Electrical load sensor – circuit/voltage high Wiring, electrical load sensor, ECM
22 P1259 VTEC system malfunction Wiring, VTEC solenoid/pressure switch, ECM
23 Knock sensor (KS) – circuit malfunction Wiring, KS, ECM
26 3rd clutch pressure switch – circuit malfunction Wiring, poor connection, 3rd clutch pressure switch, ECM
28 Transmission fluid temperature (TFT)   sensor – circuit malfunction Wiring, TFT sensor, ECM
40 Torque converter clutch (TCC) solenoid – circuit malfunction Wiring, TCC solenoid, ECM
41 Heated oxygen sensor (H02S) -front- heater circuit malfunction Wiring, ECM
45 Mixture too lean/rich Fuel system, front H025, MAP sensor, mechanical fault
58 Camshaft position (CMP) sensor 2 – no signal/intermittent signal Wiring, CMP sensor, ECM
61 Heated oxygen sensor (H02S)- front – slow response H02S, exhaust system
63 Heated oxygen sensor (H02S) – rear- slow response/circuit/voltage low/high Wiring, H02S, ECM
65 Heated oxygen sensor (H02S) – rear- circuit malfunction Wiring, ECM
67 Catalytic converter – efficiency below limit Catalytic converter, rear H02S
70 AT- lock-up clutch not engaging/no gear shift Wiring, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (55) AlB, ECM
70 P1656 Electronic stability programme (ESP) control module – communication malfunction Wiring, ESP control module, ECM
70 P1705 AT- gear shift malfunction Wiring, range position switch, ECM
70 P1706 AT – gear shift malfunction Wiring, range position switch, ECM
70 P1739 AT – 3rd clutch pressure switch Wiring, 3rd clutch pressure switch, ECM
70 P1740 AT -4th clutch pressure switch Wiring, range position switch, ECM
70 P1750 AT – hydraulic system mechanical malfunction Wiring, range position switch, ECM
70 P1751 AT – hydraulic system mechanical malfunction Wiring, range position switch, ECM
71 Cylinder No.1 – misfire Wiring, injector, ignition system, mechanical fault
72 Cylinder No.2 – misfire Wiring, injector, ignition system, mechanical fault
73 Cylinder No.3 – misfire Wiring, injector, ignition system, mechanical fault
74 Cylinder No.4 – misfire Wiring, injector, ignition system, mechanical fault
75 Cylinder No.5 – misfire Wiring, injector, ignition system, mechanical fault
76 Cylinder No.6 – misfire Wiring, injector, ignition system, mechanical fault
P1399 Random misfire Fuel/ignition system, MAP sensor, lAC valve
80 Exhaust gas recirculation (EGR) solenoid – insufficient flow EGR solenoid, hose/pipe leak or blockage
86 Engine coolant temperature (ECT) sensor – range/performance problem ECT sensor, cooling system
87 Thermostat – range/performance problem Thermostat, cooling system
90 P1456 Evaporative emission (EVAP) canister purge system (fuel tank system) – leak detected Hose, fuel tank/pressure sensor, fuel filler cap, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve
90 P1457 Evaporative emission (EVAP) canister purge system (canister system) – leak detected Hose, fuel tank/pressure sensor, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve
91 Fuel tank pressure sensor- circuit/voltage low/high Wiring, pressure sensor, ECM
P1607 Engine control module (ECM) – internal circuit failure ECM
121 Fuel tank level sensor- range/performance problem Wiring, fuel tank level sensor
121 Fuel tank level sensor- low input Wiring short to ground, fuel tank level sensor, ECM
121 Fuel tank level sensor- high input Wiring short to positive, fuel tank level sensor, ECM