Engine management light

[rico]

Ive had a couple of instance where my car has died - the engines running, but the throttle just doesnt respond and the yellow engine light has come on.

Turning the car off and on again ( based on my years of IT training ) always works. ?Any ideas? ?The supra has a physical throttle cable doesnt it, so i can't understand how it just stops working.

Any help greatly appreciated.

[alex h]

You need to see if you are getting any engine fault codes. There is a guide on the tech section of www.mkiv.com as to how to get the fault codes yourself - or you can take it to Toyota.

http://www.mkiv.com/techarticles/eng...bd1_codes.html

DIAGNOSIS SYSTEM

Entered by Carey Morris from the 1994 Engine Repair Manual

DESCRIPTION

The ECM contains a built-in self-diagnosis system by which troubles with the engine signal network are detected and a malfunction indicator lamp on the instrument panel lights up.

By analyzing various signals as shown in a later table (see table below) the Engine Control Module (ECM) detects system malfunctions relating to the sensors or actuators.

In the normal mode, the self-diagnosis system monitors 19 items, indicated by code No. as shown (see table below). A malfunction indicator lamp informs the driver that a malfunction has been detected. The lamp goes off automatically when the malfunction has been repaired. But the diagnostic trouble code(s) remains stored in the ECM memory (except for code Nos. 16 and 53). The ECM stores the code(s) until it is cleared by removing the EFI No. 1 fuse with the ignition switch off.

The diagnostic trouble code can be read by the number of blinks of the malfunction indicator lamp when TE1 and E1 terminals on the data link connector 1 or 2 are connected. When 2 or more codes are indicated, the lowest number (code) will appear first.

In the test mode, 13 items, indicated by code No. as shown (see table below) are monitored. If a malfunction is detected in any one of the systems indicated by code Nos. 13, 21, 22, 24, 25, 26, 27, 35, 41, 47, 71 and 78 the ECM lights the malfunction indicator lamp to warn the technician that malfunction has been detected. In this case, TE2 and E1 terminals on the data link connector 2 should be connected as shown later.

In the test mode, even if the malfunction is corrected, the malfunction code is stored in the ECM memory even when the ignition switch is off (except code Nos. 42 and 51). This also applies in the normal mode. The diagnostic trouble mode (normal or test) and the output of the malfunction indicator lamp can be selected by connecting the TE1, TE2 and E1 terminals on the data link connector 2, as shown later.

A test mode function has been added to the functions of the self-diagnosis system of the normal mode for the purpose of detecting malfunctions such as poor contact, which are difficult to detect in the normal mode. This function fills up the self-diagnosis system. The test mode ca be implemented by the technician following the appropriate procedures of check terminal connection and operation described later.

Diagnosis Inspection (Normal Mode)
MALFUNCTION INDICATOR LAMP CHECK

The malfunction indicator lamp will come on when the ignition switch is turned ON and the engine is not running. HINT: If the malfunction indicator lamp does not lightup, proceed to troubleshooting of the telltale light RH (See page BE-61)
When the engine is started, the malfunction indicator lamp should go off. If the light remains on, the diagnosis system has detected a malfunction or abnormality in the system.


DIAGNOSTIC TROUBLE CODE CHECK

Turn ignition switch on.
Connect terminal between TE1 and E1 of data link connector 1 or 2.
Read the diagnostic trouble code from malfunction indicator lamp. HINT: If a diagnostic trouble code is not output, check the TE1 terminal circuit.
Check the details of the malfunction using the diagnostic trouble code table (see table below).
After completing the check, disconnect terminals TE1 and E1 and turn off the display. HINT: In the event of 2 or more malfunction codes, indication will begin from the smaller numbered code and continue in order to the larger.





DIAGNOSTIC TROUBLE CODE CHART (2JZ-GTE)

DTC
No. Circuit Diag.. Trouble Code Detecting Condition Trouble Area
Normal Mode Test Mode Memory
- Normal No code is recorded - - - -
12 G, NE Signal (No. 1) No "NE" or "G1" and "G2 signal to ECM for 2 sec. or more after cranking. Open or short in crankshaft position sensor, camshaft position sensor No. 1, No. 2 circuit.
Crankshaft position sensor
Camshaft position sensor No. 1, No. 2
Started
ECM
ON
n/a Yes

13 G, NE Signal (No. 2)
No NE signal to ECM for 0.1 sec. or more at 1,000 rpm or more. Open or short in crankshaft position sensor circuit.
Crankshaft position sensor
ECM
ON n/a Yes

NE signal does not pulse 12 times to ECM during the interval between G1 and G2 pulses. Open or short in crankshaft position sensor circuit.
Mechanical system malfunction (skipping teeth of timing belt, belt stretched)
Crankshaft position sensor
ECM
n/a ON
Deviation in G (G1, G2) and NE signal continues for 3 sec. during idling (throttle fully closed) after engine warmed up. Mechanical system malfunction (skipping teeth of timing belt, belt stretched)
Camshaft position sensor No. 1, No. 2
ECM
ON n/a
14 Ignition Signal
No IGF signal to ECM for 4~7 consecutive IGT signals with engine speed less than 3,000 rpm. Open or short in IGF circuit from igniter to ECM
Igniter
ECM
ON n/a Yes

16 A/T Control Signal
Fault in communications between the engine CPU and A/T CPU in the ECM. ECM
ON n/a No

21 Main Heated Oxygen Sensor Signal
Open or short in heater circuit of main heated oxygen sensor (Fr) for 0.5 sec. or more. Open or short in heater circuit of main heated oxygen sensor.
Main heated oxygen sensor heater
ECM
ON n/a Yes

Main heated oxygen sensor signal voltage is reduced to between 0.35V and 0.70V for 60 sec. under condition
a) ~ (d). (2 trip detection logic)

a). Engine coolant temp.: Between 80? C (176?F) and 95?C (203?F)
b). Engine speed: 1,500 rpm or more
c). Load driving (EX. A/T in overdrive (5th for M/T), A/C ON, Flat road, 50 mph <80 km/h&gt
d). Main heated oxygen sensor signal voltage: Alternating above and below 0.45 V.
Main heated oxygen sensor circuit
Main heated oxygen sensor
ON ON
22 Engine Coolant Temp. Sensor Circuit Open or short in engine coolant temp. sensor circuit for 0.5 sec or more. Open or short in engine coolant temp. sensor circuit.
Engine coolant temp. sensor
ECM
ON ON Yes
24 Intake Air Temp. Sensor Signal Open or short in intake air temp. sensor circuit for 0.5 sec. or more. Open or short in intake air temp. sensor circuit.
Intake air temp. sensor
ON ON Yes
25 Air-Fuel Ratio Lean Malfunction
26 Air-Fuel Ratio Rich Malfunction
27 Sub Heated Oxygen Sensor Signal
31 Mass Air Flow Meter Circuit
34 Turbo Pressure Malfunction
35 Turbo Pressure Sensor Circuit
35(?) Barometric Pressure Sensor Circuit
41 Throttle Position
Sensor Signal
42 No. 1 Vehicle Speed Sensor Signal (for A/T)
No. 1 Vehicle Speed Sensor Signal (for M/T)
43 Starter Signal
47 Sub-Throttle Position Sensor Signal
52 Knock Sensor Signal (front side)
53 Knock Control Signal Engine control computer (for knock control) malfunction at engine speed between 650 rpm and 5,200 rpm. ECM
ON n/a No

55 Knock Sensor Signal (rear side)
71 EGR System Malfunction
78 Fuel Pump Control Signal
51 Switch Condition Signal 3 sec. or more after engine starts, with closed throttle position switch OFF (IDL1).
Park/neutral position switch: OF (Shift position in "R", "D", "2", or "L" position)
A/C switch ON.
A/C switch circuit.
Throttle position sensor IDL circuit.
Park/neutral position switch circuit
Accelerator pedal and cable.
ECM
n/a OFF No

[alex h]

Hang on you have a 98 - that's ODBII - which is not the same as above...

[alex h]

http://www.mkiv.com/techarticles/eng...bd2_codes.html

Don't know if you connect the same pins to get the diag codes or whether it's a Toyota job but here are the ODBII codes.

OBD-II Diagnostic Codes
Toyota Supra 1996-1998
P0100 Mass Air Flow Circuit.
P0101 Mass Air Flow Circuit Range/Performance.
P0105 Manifold Absolute Pressure Circuit.
P0106 MAP/BARO Circuit Range/Performance.
P0110 Intake Air Temperature Circuit.
P0115 Engine Coolant Temperature Circuit.
P0116 Engine Coolant Temperature Range/Performance.
P0120 Throttle Pedal Sensor Switch "A" Circuit.
P0121 Throttle Pedal Sensor Switch "A" Circuit Range/Performance.
P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control.
P0130 Heated Oxygen Sensor Circuit - Bank 1 Sensor 1.
P0133 Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1.
P0135 Heated Oxygen Sensor Circuit - Bank 1 Sensor 1.
P0136 Heated Oxygen Sensor Circuit - Bank 1 Sensor 2.
P0141 Heated Oxygen Sensor Circuit - Bank 1 Sensor 2.
P0150 Heated Oxygen Sensor Circuit - Bank 2 Sensor 1.
P0153 Heated Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1.
P0155 Heated Oxygen Sensor Circuit - Bank 2 Sensor 1.
P0156 Heated Oxygen Sensor Circuit - Bank 2 Sensor 2.
P0161 Heated Oxygen Sensor Circuit - Bank 2 Sensor 2.
P0170 Fuel Trim malfunction.
P0171 System too Lean.
P0172 System too Rich.
P0201 Injector Circuit - Cyl. 1.
P0202 Injector Circuit - Cyl. 2.
P0203 Injector Circuit - Cyl. 3.
P0204 Injector Circuit - Cyl. 4.
P0205 Injector Circuit - Cyl. 5.
P0206 Injector Circuit - Cyl. 6.
P0300 Random Misfire.
P0301 Misfire Detected - Cyl. 1.
P0302 Misfire Detected - Cyl. 2.
P0303 Misfire Detected - Cyl. 3.
P0304 Misfire Detected - Cyl. 4.
P0305 Misfire Detected - Cyl. 5.
P0306 Misfire Detected - Cyl. 6.
P0325 Knock Sensor 1 Circuit.
P0330 Knock Sensor 2 Circuit.
P0335 Crankshaft Position Sensor "A" Circuit.
P0336 Crankshaft Position Sensor "A" Circuit Range/Performance.
P0340 CMP Sensor Circuit malfunction.
P0385 Crankshaft Position Sensor "B" NE2 Circuit.
P0401 EGR Flow Insufficient.
P0402 EGR Flow Excessive.
P0420 Catalyst System Efficiency below Threshold.
P0430 Catalyst System Efficiency below Threshold Bank 2.
P0440 EVAP Control System.
P0441 EVAP Control System Improper Purge Flow.
P0446 EVAP Control System Vent Control.
P0450 EVAP Control System Pressure Sensor.
P0451 EVAP Control System Pressure Sensor Range/Performance.
P0500 Vehicle Speed Sensor.
P0505 Idle Speed Control System.
P0510 Close Throttle Position Switch.
P1100 BARO Sensor Circuit.
P1120 Accelerator Pedal Position Sensor Circuit.
P1121 Accelerator Pedal Position Sensor Range/Performance Problem.
P1125 Throttle Control Motor Circuit.
P1126 Magnetic Clutch Circuit.
P1127 ETCS Actuator Power Source Circuit.
P1128 Throttle Control Motor Lock.
P1129 Electric Throttle Control System.
P1130 Air-Fuel Sensor Circuit Range/Performance.
P1133 Air-Fuel Sensor Circuit Response.
P1135 Air-Fuel Sensor Heater Circuit Response.
P1150 A/F Sensor Circuit Range/Performance.
P1153 A/F Sensor Circuit Response.
P1155 A/F Sensor Heater Circuit.
P1200 Fuel Pump Relay Circuit.
P1300 Igniter Circuit - No. 1.
P1310 Igniter Circuit - No. 2.
P1335 No Crankshaft Position Sensor Signal - Engine Running.
P1349 VVT System.
P1400 Sub-Throttle Position Sensor.
P1401 Sub-Throttle Position Sensor Range/Performance Problem.
P1405 Turbo Pressure Sensor Circuit.
P1406 Turbo Pressure Sensor Range/Performance Problem.
P1410 EGR Valve Position Sensor Circuit.
P1411 EGR Valve Position Sensor Circuit Range/Performance.
P1500 Starter Signal Circuit.
P1510 Boost Pressure Control Circuit.
P1511 Boost Pressure Low.
P1512 Boost Pressure High.
P1520 Stop Lamp Switch Signal.
P1565 Cruise Control Main Switch Circuit.
P1600 ECM.
P1605 Knock Control CPU.
P1630 Traction Control System.
P1633 ECM.
P1652 Idle Air Control Valve Control Circuit.
P1656 OCV Circuit.
P1658 Wastegate Valve Control Circuit.
P1661 EGR Circuit.
P1662 EGR by-pass Valve Control Circuit.
P1780 Park/Neutral Switch.
The Diagnostic Codes and Explanations are derived from Manufacturer supplied Technical Data.

[Nathan]

Sounds very much like limp-home mode. Almost as if the plug was coming off the AFM. Getting the error codes is the only way foward as Alex says.

[alex h]

All the above was from here. ?http://www.mkiv.com/techarticles/index.html


Nathan - How do you get the codes from ODBII?? ?It's not clear from what I've read.

[Nathan]

Oh, and the VVT-i DOES have a throttle cable, but it doesn't work in quite the same way as you are thinking...