1996 TOYOTA TERCEL check engine

- DIAGNOSTICSENGINE
DI-63
1996 TERCEL (RM440U)
DTC P0340 Camshaft Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
Camshaft position sensor (G signal) consist of signal plate and pickup coil.
The G signal plate has one tooth on its outer circumference and is mounted on the exhaust camshaft.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals for every engine revolution. The ECM detects the standard crankshaft angle based on the G signals
and the actual crankshaft angle and the engine speed by the NE signals.
DTC No.DTC Detection ConditionTrouble Area
P0340
No camshaft position sensor signal to ECM during cranking
(2 trip detection logic)
Open or short in camshaft position sensor circuit

Camshaft position sensor
P0340No camshaft position sensor signal to ECM with engine speed
600 rpm or more

Camshaft osition sensor

Starter

ECM
WIRING DIAGRAM
Refer to DI-60.
INSPECTION PROCEDURE
1 Check resistance of camshaft position sensor (See page IG-1).
Reference: INSPECTION USING OSCILLOSCOPE
Refer to page DI-60.
NG Replace camshaft position sensor.
OK
2 Check for open and short in harness and connector between ECM and camshaft
position sensor (See page IN-26).
NG Repair or replace harness or connector.
OK
DI014-23

DI-64
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
3 Inspect sensor installation
NG Tighten the sensor.
OK
Check and replace ECM (See page IN-26).

P20769
Vehicle Speed
70 - 90 km/h
(43 - 56 mph)
Idling
IG SW OFF(a)(b)(c)
(d)
(e)(f)
(g)
Warm up 3 - 5 min. 2 min. 3 - 5 min. 2 min.
Time DI-66
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
SYSTEM CHECK DRIVING PATTERN
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Start the engine and warm it up with all accessories switched OFF.
(c) Run the vehicle at 70 - 90 km/h (43 - 56 mph) for 3 minutes or more.
(d) Idle the engine for about 2 minutes.
(e) Stop at safe place and turn the ignition switch OFF.
(f) Start the engine and do steps (c) and (d) again.
(g) Check the READINESS TESTS mode on the OBD II scan tool or TOYOTA hand-held tester. If COMPL
is displayed and the MIL does not light up, the system is normal. If INCMPL is displayed and the MIL
does not light up, run the vehicle again and check it.
HINT:
INCMPL is displayed when either condition (h) or (i) exists.
(h) The system check is incomplete.
(i) There is a malfunction in the system.
If there is a malfunction in the system, the MIL will light up after steps (b) to (f) above are done.
INSPECTION PROCEDURE
HINT:

If DTC P0105 and/or P0106 and P0401 are output simultaneously, perform troubleshooting of DTC
ºP0105º first.

If DTC P0401 and P0402 are output simultaneously, perform troubleshooting of DTC P0402 first.

A15708
- DIAGNOSTICSENGINE
DI-67
1996 TERCEL (RM440U)
TOYOTA hand-held tester:
1 Check connection of vacuum hose, EGR hose (See page EC-2).
NG Repair or replace.
OK
2 Check VSV for EGR.
PREPARATION:
Select the ACTIVE TEST mode on the TOYOTA hand-held tes-
ter.
CHECK:
Check operation of VSV, when it is operated by the TOYOTA
hand-held tester.
OK:
EGR system is OFF:
Air from pipe E is flowing out through the air filter.
EGR system is ON:
Air from pipe E is flowing out through pipe F.
OK Go to step 4.
NG
3 Check operation of VSV for EGR (See page EC-7).
NG Replace VSV for EGR.
OK
Check for open and short in harness and con-
nector between J/B No.2 and ECM
(See page IN-26).

DI-68
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
4 Check EGR vacuum modulator (See page EC-7).
NG Repair or replace.
OK
5 Check EGR valve (See page EC-7).
NG Repair or replace.
OK
6 Check manifold absolute pressure sensor (See page DI-23).
NG Repair or replace.
OK
Check and replace ECM (See page IN-26).
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check connection of vacuum hose, EGR hose (See page EC-2).
NG Repair or replace.
OK

A15709
- DIAGNOSTICSENGINE
DI-69
1996 TERCEL (RM440U)
2 Check VSV for EGR.
PREPARATION:
(a) Turn up the floor mat on the passenger side.
(b) Remove the 2 bolts for ECM.
(c) Disconnect the ºE5º or ºE8º connector of ECM.
(d) Turn the ignition switch ON.
CHECK:
Check VSV function
(1) Connect terminal EGR of the ECM connector and
the body ground (ON).
(2) Disconnect terminal EGR of the ECM connector
and the body ground (OFF).
OK:
(1) VSV is ON:
Air from pipe E is flowing out through pipe F.
(2) VSV is OFF:
Air from pipe E is flowing out through the air filter.
OK Go to step 4.
NG
3 Check operation of VSV for EGR (See page DI-65, step 3).
NG Replace VSV for EGR.
OK
Check for open and short in harness and
connector between J/B No.2 and ECM
(See page IN-26).
4 Check EGR vacuum modulator (See page EC-7).
NG Repair or replace.
OK

DI-70
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
5 Check EGR valve (See page EC-7).
NG Repair or replace.
OK
6 Check manifold absolute pressure sensor (See page DI-23).
NG Repair and replace.
OK
Check and replace ECM (See page IN-26).

- DIAGNOSTICSENGINE
DI-71
1996 TERCEL (RM440U)
DTC P0402 Exhaust Gas Recirculation Flow Excessive
Detected
CIRCUIT DESCRIPTION
Refer to DTC P0402 on page DI-65.
DTC No.DTC Detection ConditionTrouble Area
P0402
After the engine is warmed up, conditions (a) and (b) continue
(a) The intake manifold absolute pressure is larger than the
value calculated by the ECM while the EGR system is ON
(b) Misfiring is detected during idling
(2 trip detection logic)
EGR valve stuck open

Vacuum or EGR hose is connected to wrong post

Manifold absolute pressure sensor

ECM
INSPECTION PROCEDURE
HINT:

If DTC P0105 and/or P0106 and P0402 are output simultaneously, perform troubleshooting of DTC
P0105 first.

If DTC P0401 and P0402 are output simultaneously, perform troubleshooting of DTC P0402 first.
1 Check connection of vacuum hose, EGR hose (See page EC-2).
NG Repair or replace.
OK
2 Check EGR valve (See page EC-7).
NG Repair or replace.
OK
3 Check VSV for EGR (See page DI-65).
OK Go to step 5.
NG
DI95Q-01