1996 TOYOTA TERCEL turn signal

A15716
- DIAGNOSTICSENGINE
DI-79
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check air induction system (See page MF-1).
NG Repair or replace.
OK
2 Check A/C signal circuit (See page AC-66).
NG Repair or replace.
OK
3 Check voltage between terminals RSO, RSC of ECM connector and body ground.
PREPARATION:
(a) Remove the lower finish panel.
(b) Disconnect the E7connector of ECM.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal RSO and RSC of the
ECM connector and the body ground.
OK:
Voltage: 9 - 14 V
OK Go to step 5.
NG
4 Check IAC valve (See page MF-33).
NG Replace IAC valve.
OK

A15717
- DIAGNOSTICSENGINE
DI-81
1996 TERCEL (RM440U)
DTC P0510 Closed Throttle Position Switch Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P0120 on page DI-33.
DTC No.DTC Detection ConditionTrouble Area
P0510Closed throttle position switch does not turn ON even once
when vehicle is driven (2 trip detection logic)
Open in closed throttle position switch circuit

Closed throttle position switch

ECM
HINT:
After confirming DTC P0510, use the TOYOTA hand-held tester to confirm the closed throttle position switch
signal from the CURRENT DATA.
Throttle ValveClosed Throttle Position Switch SignalMalfunction
Fully closedOFFOpen circuit
Fully openONShort circuit
WIRING DIAGRAM
Refer to DTC P0120 on page DI-33.
INSPECTION PROCEDURE
HINT:
If DTCs P0110, P0115 and P0120 are output simultaneously, E2 (sensor ground) may be open.
TOYOTA hand-held tester:
1 Check for open in harness or ECM.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Disconnect the throttle position sensor connector.
(c) Connect the sensor wire harness terminals between ter-
minals 3 and 4.
(d) Turn the ignition switch ON.
CHECK:
Read thg CTP switch signal on the TOYOTA hand-held tester.
OK:
CTP switch signal: ON
OK Confirm good connection at sensor. If OK, re-
place throttle position sensor.
NG
DI95R-01

A15718
A15719
DI-82
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See page MF-54).
(b) Connect terminals IDL and E2 of the ECM connector to-
gether.
HINT:
The throttle position sensor connector is disconnected. Before
checking, do a visual check and contact pressure check for the
connector (See page IN-26).
(c) Turn the ignition switch ON.
CHECK:
Read the CTP switch signal on the TOYOTA hand-held tester.
OK:
CTP switch signal: ON
OK Open in harness between ECM and throttle
position sensor, repair or replace harness.
NG
Confirm connection at ECM. If OK, replace
ECM.
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the throttle position sensor connector.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals 3 and 4 of the throttle
position sensor connector.
OK:
Voltage: 9 - 14 V
OK Confirm good connection at sensor. If OK, re-
place throttle position sensor.

A15722
A15723
DI-86
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
OK
3 Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
PREPARATION:
(a) Disconnect the igniter connector.
(b) Remove the lower finish panel.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal IGF of the ECM connec-
tor and the body ground.
OK:
Voltage: 4.5 - 5.5 V
OK Replace igniter.
NG
Check and replace ECM (See page IN-26).
4 Check for open and short in harness and connector in IGT1 and IGT2 signal cir-
cuits between ECM and igniter (See page IN-26).
NG Repair or replace harness or connector.
OK
5 Check voltage between terminals IGT1 and IGT2 of ECM connector and body
ground.
PREPARATION:
Remove the lower finish panel.
CHECK:
Measure the voltage between terminals IGT1 and IGT2 of the
ECM connector and the body ground when the engine is
cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V

P19902
IGT1 / IGF signal waveform
10 m sec./Division (Idling) IGT12V/
Division
IGF
A15725
A15726
- DIAGNOSTICSENGINE
DI-87
1996 TERCEL (RM440U)
Reference: INSPECTION USING OSCILLOSCOPE
During idling, check waveform between terminals IGT1 and E1
of ECM.
HINT:
The correct waveform are as shown.
IGT2 signal waveform is same as the IGT1 signal waveform.
NG Check and replace ECM (See page IN-26).
OK
6 Disconnect igniter connector and check voltage between terminals IGT1 and
IGT2 of ECM connector and body ground.
PREPARATION:
(a) Disconnect the igniter connector.
(b) Remove the lower finish panel.
CHECK:
Measure the voltage between terminals IGT1 and IGT2 of the
ECM connector and the body ground when the engine is
cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
NG Check and replace ECM (See page IN-26).
OK
7 Check voltage between terminal 7 of igniter connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
Measure the voltage between terminal 7 of igniter connector
and the body ground, when ignition switch is turned to ON and
START position.
OK:
Voltage: 9 - 14 V
NG Check and repair igniter power source circuit.
OK

- DIAGNOSTICSENGINE
DI-91
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the problem symptoms table on page DI-19.
1 Connect TOYOTA hand-held tester, and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
CHECK:
Read the STA signal on the TOYOTA hand-held tester while the starter operates.
OK:
Ignition Switch PositionONSTART
STA SignalOFFON
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-19).
NG
2 Check for open in harness and connector between ECM and starter relay (See
page IN-26).
NG Repair or replace or connector.
OK
Check and replace ECM.

A15736
DI-100
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit
opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
DI4LM-02

A15737
DI-102
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
TOYOTA hand-held tester:
1 Connect TOYOTA hand-held tester and check operation of fuel pump
(See page MF-1).
OK Check for starter signal circuit.
NG
2 Check for ECM power source circuit (See page DI-97).
NG Repair or replace.
OK
3 Check circuit opening relay (See page MF-40).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM and body ground.
PREPARATION:
(a) Remove the lower finish panel.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal FC of ECM and body
ground.
OK:
Voltage: 9 - 14 V
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay,
circuit opening relay and ECM.
OK