| Model | Year | Engine identification | System |
|---|---|---|---|
| Supra 3.0L | 1993-95 | 2JZ-GE | TCCS |
| Supra 3.0L Turbo | 1993-95 | 2JZ-GTE | TCCS |
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.
- ECM trouble codes can be accessed with suitable code reader connected to the data link connector (DLC) [1] or displayed by the MIL.
- NOTE: A second diagnostic link connector is fitted [2] , which can also be used to output diagnostic codes.
Preparatory conditions
- Battery voltage 11 V minimum.
- Closed throttle position (CTP) switch fully closed.
- Transmission in neutral position.
- All auxiliary equipment, including air conditioning, switched OFF.
- Engine at normal operating temperature.
Accessing – Normal mode
- Switch ignition ON. Do NOT start engine.
- Check MIL illuminates.
- Switch ignition OFF.
- Jump DLC terminals TE1 and E1 with a short lead [1] or [2]
- Switch ignition ON.
- Count MIL flashes and compare with trouble code table. ·
- First flashes of 0.5 second duration indicate ‘tens’, after a 1.5 second pause, next flashes of 0.5 second duration indicate ‘units’ [3].
- A 2.5 second pause occurs between codes.
- After a 4.5 second pause, trouble codes will be repeated.
NOTE: The MIL flashes once every 0.25 seconds if the system is correct [4].
- Switch ignition OFF.
- Remove jump lead.
Accessing – Test mode
- Carry out preparatory conditions as in normal mode.
- Jump DLC terminals TE2 and E1 with a short lead [1]
- Switch ignition ON. Do NOT start engine.
- Check MIL is flashing to confirm test mode is operating.
NOTE: Test mode will not be activated if the DLC terminals are connected after the ignition switch is turned ON.
- Start the engine.
- Drive vehicle over 10 mph to simulate possible fault conditions.
- Stop vehicle.
- Jump DLC terminals TE1 and E1 with a short lead [1].
- Count MIL flashes and compare with trouble code table.
- Switch ignition OFF.
- Remove jump leads.
Erasing
- Ensure ignition switched OFF.
- Remove EFI fuse (30A) from underhood fusebox [5]
- Wait 30 seconds.
- Reinstall fuse.
- 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
Flash code | Fault location | Probable cause |
12 | Crankshaft position (CKP) sensor – circuit | Wiring, CKP sensor, starter motor, ECM |
12 | Camshaft position (CMP) sensor 1 & 2 – circuit | Wiring, CMP sensor, starter motor, ECM |
13 | Crankshaft position (CKP) sensor – above 1000 rpm | Wiring, valve timing, CKP sensor, ECM |
13 | Camshaft position (CMP) sensor- above 1000 rpm | Wiring, valve timing, CMP sensor, ECM |
14 | Ignition reference signal – no signal | Wiring, ignition module, ECM |
16 | Transmission control signal – malfunction | ECM |
21 | Heated oxygen sensor (H02S) 1 – front – circuit | Wiring, H02S, ECM |
22 | Engine coolant temperature (ECT) sensor – circuit | Wiring, ECT sensor, ECM |
24 | Intake air temperature (IAT) sensor- circuit | Wiring, IAT sensor, ECM |
25 | Mixture control – continuously lean | Wiring, injector, H02S, MAFNAF sensor, valve timing, intake/fuel/ignition, ECM |
26 | Mixture contro.l – continuously rich | Wiring, injector, intake/fuel/ignition system, valve timing, MAFNAF sensor, ECM |
27 | Heated oxygen sensor (H02S) – rear- circuit | Wiring, H02S, ECM |
28 | Heated oxygen sensor (H02S) 2 -front- circuit | Wiring, H02S, ECM |
31 | Volume air flow (VAF) sensor- 2JZ-GE – circuit | Wiring, VAF sensor, ECM |
31 | Mass air flow (MAF) sensor- 2JZ-GTE – circuit | Wiring, MAF sensor, ECM |
34 | Turbocharger (TC) boost pressure – pressure too high | TC wastegate regulating valve/actuator, wiring, ECM |
35 | Barometric pressure (BARO) sensor – circuit | ECM |
35 | Turbocharger (TC) boost pressure sensor- circuit | Wiring, TC boost pressure sensor, ECM |
41 | Throttle position (TP) sensor – circuit | Wiring, TP sensor, ECM |
42 | Vehicle speed sensor (VSS)- circuit | Wiring, instrument cluster, VSS, ECM |
43 | Starter signal- circuit | Wiring, ignition switch, engine control relay, ECM |
47 | Throttle position {TP) sensor 2 – circuit | Wiring, TP sensor, ECM |
51 | Switch signal – NC switch ON during diagnosis | Wiring, NC switch, ECM |
51 | Switch signal – closed throttle position (CTP) switch OFF during diagnosis | Wiring, CTP switch, ECM |
51 | Switch signal -park neutral position (PNP) switch not in P or N during diagnosis | Wiring, PNP switch, ECM |
52 | Knock sensor (KS)- front- circuit | Wiring, KS, ECM |
53 | Knock control – malfunction | ECM |
55 | Knock sensor (KS)- rear- circuit | Wiring, KS, ECM |
71 | Exhaust gas recirculation (EGR) system – circuit | Wiring, EGRT sensor, EGR valve/solenoid, hose leak/blockage, ECM |
78 | Fuel pump control – circuit | Wiring, fuel pump/control module, ECM/supply |