PROBLEM SYMPTOMS TABLE
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- Wendy Merilyn Nicholson
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1 2 2UZ-FE SFI SYSTEM PROBLEM SYMPTOMS TABLE Symptom Suspected Area See page 1. Cranking holding function circuit -46 Engine does not crank (does not start) 2. Starter ST Starter relay ST-1 4. VC output circuit ECM power source circuit -454 No initial combustion (does not start) 2. VC output circuit Fuel pump control circuit ECM -510 No complete combustion (does not start) Fuel pump control circuit Starter signal circuit -20 Difficult to start (engine cranks normally) 2. Fuel pump control circuit Compression EM-3 Difficult to start (with cold engine) 1. Starter signal circuit Fuel pump control circuit -463 Difficult to start (with hot engine) 1. Starter signal circuit Fuel pump control circuit -463 High engine idle speed (poor idling) 1. A/C signal circuit (compressor circuit) AC-2 2. ECM power source circuit -454 Low engine idle speed (poor idling) 1. A/C signal circuit (compressor circuit) AC-2 2. Fuel pump control circuit -463 Rough idling (poor idling) 1. Compression EM-3 2. Fuel pump control circuit -463 Hunting (poor idling) 1. ECM power source circuit Fuel pump control circuit -463 Hesitation/Poor acceleration (Poor driveability) 1. ECM power source circuit A/T faulty - Engine stalls during A/C operation 1. A/C signal circuit (Compressor circuit) AC-2 2. ECM -510 Surging (Poor driveability) Fuel pump control circuit -463 Unable to refuel/difficult to refuel ORVR system - Engine stalls soon after starting Fuel pump control circuit -463
2 30 2UZ-FE ENGINE CONTROL SYSTEM SFI SYSTEM TERMINALS OF ECM 1. ECM E4 E5 E6 E7 E A121603E05 The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the STD Voltage column. The illustration above can be used as a reference to identify the ECM terminal locations. Symbols (Terminal No.) Wiring Color Terminal Description STD Voltage BATT (E-3) - E1 (E6-1) L - W-B Battery (for measuring the battery voltage and for the ECM memory) Always +BM (E-7) - E1 (E6-1) GR - W-B Power source of throttle motor Always IGSW (E-) - E1 (E6-1) B-O - W-B Ignition switch +B (E-1) - E1 (E6-1) B - W-B Power source of ECM +B2 (E-2) - E1 (E6-1) B - W-B Power source of ECM MREL (E-) - E1 (E6-1) W-G - W-B EFI relay VC (E4-23) - E2 (E4-2) L-R - BR Power source for sensor (specific voltage) VG (E4-30) - E2G (E4-2) W-R - B-W Mass air flow meter THA (E4-22) - E2 (E4-2) THW (E4-21) - E2 (E4-2) VTA1 (E4- - E2 (E4-2) VTA1 (E4- - E2 (E4-2) VTA2 (E4-1) - E2 (E4-2) VTA2 (E4-1) - E2 (E4-2) Y-B - BR R-L - BR Y - BR Y - BR R-B - BR R-B - BR Intake air temperature sensor Engine coolant temperature sensor (for engine control) (for engine control) (for sensor malfunction detection) (for sensor malfunction detection), shift lever position P or N, A/C switch OFF, Intake air temperature 20 C (6 F), Engine coolant temperature 0 C (176 F), throttle valve fully closed, throttle valve, throttle valve, throttle valve 0.5 to 3.0 V 0.5 to 3.4 V 0.2 to 1.0 V 0.5 to 1.2 V 3.2 to 4. V 2.1 to 3.1 V
3 31 Symbols (Terminal No.) Wiring Color Terminal Description STD Voltage VPA (E-1) - EPA (E- VPA (E-1) - EPA (E- VPA2 (E-1) - EPA2 (E- 21) OC1+ (E6-17) - OC1- (E6-16) OC2+ (E6-15) - OC2- (E6-14) VV1+ (E6-25) - VV1- (E6-24) VV2+ (E6-1) - VV2- (E6-2) W-R - LG-B W-R - LG-B R-B - V-W P - LG R-W - Y-R Y*1 - L*1 R*1 - G*1 sensor (for engine control) sensor (for engine control) sensor (for sensor malfunction detection) Camshaft timing oil control valve (OCV) Camshaft timing oil control valve (OCV) Variable valve timing (VVT) sensor (Bank 1) Variable valve timing (VVT) sensor (Bank 2), throttle valve fully closed, throttle valve, throttle valve fully closed M+ (E4-5) - E1 (E6-1) R*1 - W-B Throttle motor 0.5 to 1.1 V 2.6 to 4.5 V 1.2 to 2.0 V (See waveform 3) (See waveform 3) (See waveform 4) (See waveform 4) (See waveform 7) M- (E4-4) - E1 (E6-1) G*1 - W-B Throttle motor (See waveform ) A1A+ (E5-22) - E1 (E6-1) Y*1 - W-B A/F sensor 3.3 V*2 A1A- (E5-30) - E1 (E6-1) BR*1 - W-B A/F sensor 3.0 V*2 A2A+ (E5-23) - E1 (E6-1) P*1 - W-B A/F sensor 3.3 V*2 A2A- (E5-31) - E1 (E6-1) L*1 - W-B A/F sensor 3.0 V*2 HA1A (E5-2) - E1 (E6-1) R-L - W-B A/F sensor heater Below 3.0 V HA1A (E5-2) - E1 (E6-1) R-L - W-B A/F sensor heater HA2A (E5-1) - E1 (E6-1) B-W - W-B A/F sensor heater Below 3.0 V HA2A (E5-1) - E1 (E6-1) B-W - W-B A/F sensor heater VPA2 (E-1) - EPA2 (E- 21) VCPA (E-26) - EPA (E- VCP2 (E-27) - EPA2 (E- 21) OX1B (E4-1) - E1 (E6-1) OX2B (E5-33) - E1 (E6-1) R-B - V-W B-Y - LG-B W-L - V-W B*1 - W-B W*1 - W-B sensor (for sensor malfunction detection) Power source of accelerator pedal position sensor (for VPA) Power source of accelerator pedal position sensor (for VPA2) Heated oxygen sensor, throttle valve Maintain engine speed at 2,500 rpm for 2 minutes after warming up 3.4 to 5.3 V (See waveform 10) HT1B (E4-1) - E1 (E6-1) G-Y - W-B Heated oxygen sensor HT2B (E5-5) - E1 (E6-1) P - W-B heater Below 3.0 V HT1B (E4-1) - E1 (E6-1) G-Y - W-B Heated oxygen sensor HT2B (E5-5) - E1 (E6-1) P - W-B heater #10 (E6-2) - E01 (E4-7) R-L - W-B #20 (E6-3) - E01 (E4-7) L - W-B #30 (E6-4) - E01 (E4-7) W - W-B #40 (E6-5) - E01 (E4-7) Y - W-B #50 (E6-6) - E01 (E4-7) G - W-B Injector #60 (E6-7) - E01 (E4-7) R - W-B #70 (E4-3) - E01 (E4-7) W - W-B #0 (E4-2) - E01 (E4-7) BR - W-B
4 32 2UZ-FE ENGINE CONTROL SYSTEM SFI SYSTEM Symbols (Terminal No.) Wiring Color Terminal Description STD Voltage #10 (E6-2) - E01 (E4-7) R-L - W-B #20 (E6-3) - E01 (E4-7) L - W-B #30 (E6-4) - E01 (E4-7) W - W-B #40 (E6-5) - E01 (E4-7) Y - W-B #50 (E6-6) - E01 (E4-7) G - W-B Injector #60 (E6-7) - E01 (E4-7) R - W-B #70 (E4-3) - E01 (E4-7) W - W-B #0 (E4-2) - E01 (E4-7) BR - W-B KNK1 (E5-2) - EKNK (E5-2) G*1 - R*1 Knock sensor KNK2 (E5-21) - EKN2 (E5- W*1 - B*1 Knock sensor G2+ (E6-1) - G2- (E6-2) B - W Camshaft position sensor Maintain engine speed at 4,000 rpm after warming up Maintain engine speed at 4,000 rpm after warming up (See waveform 1) (See waveform 2) (See waveform 2) (See waveform 5) NE+ (E6-21) - NE- (E6- L*1 - Y*1 Crankshaft position sensor (See waveform 5) PRG (E4-34) - E1 (E6-1) Y-R - W-B VSV for EVAP SPD (E7-) - E1 (E6-1) V-R - W-B Speed signal from combination meter, Rotate driving wheel slowly (See waveform 6) FPR (E6-30) - E1 (E6-1) G-R - W-B Fuel pump relay 0 to 3.0 V FC (E-10) - E1 (E6-1) GR-B - W-B Fuel pump control IGT1 (E4-) - E1 (E6-1) LG - W-B IGT2 (E4-15) - E1 (E6-1) LG-B - W-B IGT3 (E4-11) - E1 (E6-1) L-W - W-B IGT4 (E4-10) - E1 (E6-1) L-Y - W-B Ignition coil with igniter IGT5 (E4-13) - E1 (E6-1) B-L - W-B (ignition (See waveform ) IGT6 (E4-12) - E1 (E6-1) G - W-B IGT7 (E4-14) - E1 (E6-1) G-W - W-B IGT (E4-) - E1 (E6-1) G-B - W-B IGF1 (E4-24) - E1 (E6-1) R-Y - W-B Ignition coil with igniter IGF2 (E4-25) - E1 (E6-1) R-W - W-B (ignition confirmation IGF1 (E4-24) - E1 (E6-1) R-Y - W-B Ignition coil with igniter (ignition confirmation IGF2 (E4-25) - E1 (E6-1) R-W - W-B (See waveform ) STP (E-15) - E1 (E6-1) G-Y - W-B Stop light switch Brake pedal depressed 7.5 to 14 V STP (E-15) - E1 (E6-1) G-Y - W-B Stop light switch Brake pedal released Below 1.5 V ST1- (E-16) - E1 (E6-1) ST1- (E-16) - E1 (E6-1) STAR/NSW (E5-) - E1 (E6-1) STAR/NSW (E5-) - E1 (E6-1) R-L - W-B R-L - W-B P - W-B P - W-B Stop light switch (opposite to STP terminal) Stop light switch (opposite to STP terminal) Park/Neutral position switch Park/Neutral position switch, Brake pedal depressed, Brake pedal released, Shift lever position other than P and N, Shift lever position in P, N Below 1.5 V 7.5 to 14 V Below 3.0 V W (E7-30) - E1 (E6-1) R-B - W-B MIL W (E7-30) - E1 (E6-1) R-B - W-B MIL Below 3.0 V ELS1 (E7-13) - E1 (E6-1) G - W-B Electric load ELS2 (E7-12) - E1 (E6-1) Y-G - W-B Electric load Taillight switch ON, Defogger switch ON Taillight switch OFF, Defogger switch OFF 7.5 to 14 V 0 to 1.5 V TACH (E7-1) - E1 (E6-1) B-W - W-B Engine speed (See waveform 11) TC (E-23) - E1 (E6-1) P-L - W-B Terminal TC of DLC3
5 33 Symbols (Terminal No.) Wiring Color Terminal Description STD Voltage STA (E6-11) - E1 (E6-1) B-Y - W-B Starter signal Cranking 6 V or higher STA (E6-11) - E1 (E6-1) B-Y - W-B Park/neutral position switch Shift lever position P or N, Ignition switch START STSW (E6-12) - E1 (E6-1) L-Y - W-B STA No. 2 fuse Shift lever position P or N, Ignition switch START VPMP (E-5) - E1 (E6-1) R-G - W-B Canister closed valve V to 14 V MPMP (E-6) - E1 (E6-1) O - W-B Leak detection pump Vacuum pump OFF 0 V to 3 V MPMP (E-6) - E1 (E6-1) O - W-B Leak detection pump Vacuum pump ON V to 14 V PPMP (E-22) - E1 (E6-1) R - W-B Vapor pressure sensor 3 V to 3.6 V AIV1 (E4-27) - E1 (E6-1) AIV2 (E4-26) - E1 (E6-1) AIRV (E-4) - E1 (E6-1) P - W-B L - W-B Y - W-B VSV for air injection control (Bank 1) VSV for air injection control (Bank 2) AI driver (ASV control AIRP (E-25) - E1 (E6-1) G - W-B AI driver (Air pump control AIP (E4-32) - E1 (E6-1) W-L - W-B Air pressure sensor 3 V to 3.6 V *1: Shielded *2: The ECM terminal voltage is constant regardless of the output voltage from the sensor. 20 V/DIV. (a) WAVEFORM 1 Fuel injector s Between #10 (to #40) and E01 20 V/DIV., 20 msec./div. 20 msec./div. A0327E06 1 V/DIV. GND (b) WAVEFORM 2 Knock sensor Between KNK1 and EKNK Between KNK2 and EKN2 1 V/DIV., 1 msec./div. Maintain engine RPM at 2,000 rpm after engine warmed-up 1 msec./div. A0526E15 The waveforms and amplitudes displayed differ slightly depending on the vehicle.
6 34 2UZ-FE ENGINE CONTROL SYSTEM SFI SYSTEM 0.2 V/DIV. (c) WAVEFORM 3 Camshaft timing oil control valve (OCV) Between OC1+ and OC1- Between OC2+ and OC2-0.2 V/DIV., 200 msec./div. B A Accelerate slowly after engine warmedup 200 msec./div. A0321E07 In the DATA LIST, the items VVT OCV DUTY B1 and B2 show the duty ratio of voltage flowing to the OCV (see illustration). VVT OCV DUTY B1, B2 = A/B x 100 (%) 2 V/ DIV. CH1 CH2 CH3 (d) WAVEFORM 4 Variable Valve Timing (VVT) sensor (bank 1, 2) and Crankshaft position sensor CH1: Between VV1+ and VV1- CH2: Between VV2+ and VV2- CH3: Between NE+ and NE- 2 V/DIV., 20 msec./div. Idle after engine warmed-up 20 msec./div. A05260E11 2 V/DIV Crank Angle (e) WAVEFORM 5 Camshaft position sensor and Crankshaft position sensor GND msec./div A1373E01 Between G2+ and G2-2 V/DIV, 200 msec./div Idle after engine warmed up The wavelength becomes shorter as the engine rpm (f) WAVEFORM 6 Vehicle speed signal Between SPD2+ and SPD2-, 10 msec./div. Driving by 40 km/h (25 mph) 10 msec./div. A03224E1
7 35 (g) WAVEFORM 7 Throttle actuator positive terminal Between M+ and ME01, 1 msec./div. Idle after engine warmed-up 1 msec./div. A03274E10 The duty ratio varies depending on the throttle opening operation. (h) WAVEFORM Throttle actuator negative terminal Between M- and ME01, 1 msec./div. Idle after engine warmed-up 1 msec./div. A03275E0 The duty ratio varies depending on the throttle opening operation. 2 V/DIV. (i) WAVEFORM Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM) (a) (b) 20 msec./div. A0327E14 (a) Between IGT1 (to IGT) and E1 (b) Between IGF1 (IGF2) and E1 2 V/DIV., 20 msec./div. 0.2 V/DIV. (j) WAVEFORM 10 Heated oxygen (HO2) sensor s Between OX1B and E2 s 0.2 V/DIV., 200 msec./div. s Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor 200 msec./div. A063E13 In the DATA LIST, item O2S B1S2 shows the ECM input values from the heated oxygen sensor. (k) WAVEFORM 11 Engine speed signal s Between TACH and E1, 10 msec./div. 10 msec./div. A03225E07
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