Home ReviewsRefund
Home/Infiniti/Q45/Infiniti Q45 II (1996-2001)/Repair manual/Testing & Diagnostics/Engine Controls - Self-Diagnostics - Testing - Q45: Overview
Contents Wiring diagrams Section: Testing & Diagnostics All sections

Engine Controls - Self-Diagnostics - Testing - Q45: Overview Infiniti Q45 II

Testing & Diagnostics 3 illustrations ~280 words

DESCRIPTION

Note. For PCM harness identification (Scheme 6)and (Scheme 7).

Scheme 6

Scheme 6: DESCRIPTION
Scheme 6: DESCRIPTION

Scheme 7

Scheme 7
Scheme 7

DIAGNOSTIC TROUBLE CODE IDENTIFICATION

Scan Tool DTCMILSystem/Circuit Affected
P00000505No Malfunction/Normal Condition
P01000102Mass Air Flow (MAF) Sensor
P01050803Absolute Pressure Sensor
P01100401Intake Air Temperature Sensor
P01150103Engine Coolant Temperature (ECT) Sensor
P01200403Throttle Position (TP) Sensor
P01250908Engine Coolant Temperature (ECT) Sensor
P01300303(1) B1 Front HO2S Circuit
P01310411(1) B1 Front HO2S Circuit
P01320410(1) B1 Front HO2S Circuit
P01330409(1) B1 Front HO2S Circuit
P01340412(1) B1 Front HO2S Circuit
P01350901(1) B1 Front HO2S Heater Circuit
P01370511(1) B1 Rear HO2S Circuit
P01380510(1) B1 Rear HO2S Circuit
P01390707(1) B1 Rear HO2S Circuit
P01400512(1) B1 Rear HO2S Circuit
P01410902(1) B1 Rear HO2S Heater Circuit
P01500503(2) B2 Front HO2S Circuit
P01510415(2) B2 Front HO2S Circuit
P01520414(2) B2 Front HO2S Circuit
P01530413(2) B2 Front HO2S Circuit
P01540509(2) B2 Front HO2S Circuit
P01551001(2) B2 Front HO2S Heater Circuit
P01570314(2) B2 Rear HO2S Circuit
P01580313(2) B2 Rear HO2S Circuit
P01590708(2) B2 Rear HO2S Circuit
P01600315(2) B2 Rear HO2S Circuit
P01611002(2) B2 Rear HO2S Heater Circuit
P01710115Fuel System Lean B1
P01720114Fuel System Rich B2
P01740210Fuel System Lean B2
P01750209Fuel System Rich B2
P01800402Tank Fuel Temperature (TFT) Sensor
P03000701Random Misfire Detected
P03010608No. 1 Cylinder Misfire Detected
P03020607No. 2 Cylinder Misfire Detected
P03030606No. 3 Cylinder Misfire Detected
P03040605No. 4 Cylinder Misfire Detected
P03050604No. 5 Cylinder Misfire Detected
P03060603No. 6 Cylinder Misfire Detected
P03070602No. 7 Cylinder Misfire Detected
P03080601No. 8 Cylinder Misfire Detected
P0325 (3)0304(1) B1 Knock Sensor
P0330 (3)0212(2) B2 Knock Sensor
P03350802Crankshaft Position Sensor
P03400101Camshaft Position Sensor
P04000302EGR Function
P04020306EGR Backpressure Transducer Valve
P04200702(1) B1 Three-Way Catalyst Malfunction
P04300703(2) B2 Three-Way Catalyst Malfunction
P04400705EVAP System Leak Detected
P04431008EVAP Purge Control Failure
P04460903EVAP Vent Control Valve (EVAP-VCV)
P04500704EVAP Pressure Sensor
P05000104Vehicle Speed Sensor (VSS)
P05050205Idle Air Control (IAC) Valve
P05100203Closed Throttle Position Sensor (CTPS)
P0600 (4)0504(5) Trans. Control Module (TCM) Signal Error
P06050301Signals Not Normal/Faulty PCM
P07051101Inhibitor Switch
P7101208(5) A/T Fluid Temperature Sensor
P7201102(5) Vehicle Speed Sensor
P7251207(5) Engine Speed Signal
P7311103(5) Incorrect Shift To 1st Gear
P7321104(5) Incorrect Shift To 2nd Gear
P7331105(5) Incorrect Shift To 3rd Gear
P7341106(5) Incorrect Shift To 4th Gear
P7401204(5) TCC Solenoid Valve
P7441107(5) Torque Converter Clutch (TCC)
P7451205(5) Line Pressure Solenoid Valve
P7501108(5) Shift Solenoid Valve A
P7551201(5) Shift Solenoid Valve A
P11051302(5) Shift Solenoid Valve B
P11100805MAP/BARO Switch Solenoid
P11200406(1) B1 Intake Valve Timing Control (IVTC)
P11250110Second TP Sensor Circuit
P11351301Tandem TP Sensor Circuit
P11401303(2) B2 Intake Valve Timing Control (IVTC)
P11451304(1) B1 IVTC Position Sensor
P11480307(2) B2 IVTC Position Sensor
P11680308(1) B1 Closed Loop Fault Detected
P12100106(2) B2 Closed Loop Fault Detected
P12201305Traction Control System Signal Circuit
P13200201Fuel Pump Control Module (FPCM)
P13360905Ignition Signal Circuit
P1400 (6)1005Crankshaft Position Sensor
P1400 (7)1005EGRC Solenoid Valve
P14010305EGR Valve & EVAP Purge Control Solenoid Valve
P14020514EGR Temperature Sensor
P1440 (6)0213EGR System Fault Detected
P1444 (6)0214EVAP Canister System Leak Detected
P1490 (6)0801EVAP Vent Control Valve (EVAP-VCV)
P1491 (6)0311EVAP-VCV By-Pass Valve
P1492 (6)0807Vacuum Cut Valve By-Pass Valve
P1493 (6)0312EVAP Canister Purge Control Valve/Solenoid Valve
P16051206(5) A/T Temperature Sensor
P17061003Park/Neutral Position Switch
(1) B1 Indicates Left Bank. (2) B2 Indicates Right Bank. (3) Freeze frame data will not be stored in the ECM for the knock sensor. The MIL will not light for a knock sensor malfunction. (4) In case of the diagnostic item, the freeze frame data will not be stored in the ECM. This diagnosis does not have 2 trip detection logic, and will not light up the MIL. (5) See appropriate AUTO TRANS DIAGNOSIS or AUTO TRANS OVERHAUL article for test procedures. (6) DTC is for California (CA) emission vehicles only. (7) DTC is for Federal emission vehicles only.
(1)B1 Indicates Left Bank.
(2)B2 Indicates Right Bank.
(3)Freeze frame data will not be stored in the ECM for the knock sensor. The MIL will not light for a knock sensor malfunction.
(4)In case of the diagnostic item, the freeze frame data will not be stored in the ECM. This diagnosis does not have 2 trip detection logic, and will not light up the MIL.
(5)See appropriate AUTO TRANS DIAGNOSIS or AUTO TRANS OVERHAUL article for test procedures.
(6)DTC is for California (CA) emission vehicles only.
(7)DTC is for Federal emission vehicles only.

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

PCM monitors switching of front and rear HO2S for each bank. (Scheme 8) A TWC with high oxygen storage capacity indicates low switching of rear HO2S. As oxygen storage capacity decreases, rear HO2S switching increases. PCM then measures switching lag time between front and rear HO2S. Longer lag time indicates greater oxygen storage capacity. If lag time is within specified range, defective TWC is indicated.

  1. Check Injectors - Ensure exhaust system leaks are not present. Start engine and warm to operating temperature. Turn engine off. Turn ignition on. Check voltage between ground and PCM connector terminals No. 1-8 and 14. (Scheme 7) If battery voltage is present at each terminal, go to next step. If battery voltage is not present at each terminal, repair harness or connector as necessary. Turn ignition off.
  2. Check Ignition Spark - Remove ignition coil assembly from rocker cover, leaving wiring harness connected. Connect a spark tester to coil assembly. Crank engine and check for good spark. If good spark is present, go to next step. If spark is not present, test ignition coil. See IGNITION CHECKS in «BASIC TESTING»(ref-18054) article. Repair or replace as necessary.
  3. Turn ignition off. Remove injector assembly, keeping fuel hoses and all injectors connected. Disconnect Camshaft Position (CMP) sensor. Turn ignition on. Verify fuel is not dripping from any injector. Replace any injector from which fuel is dripping. If all injectors are okay, check for poor connections or intermittent problem. If no fault is found, replace TWC.

Scheme 8

Scheme 8
Scheme 8

More articles — Engine Controls - Self-Diagnostics - Testing - Q45