MF-33 TOYOTA TERCEL 1996 Service Repair Manual

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

SF199-02
- MFIIDLE AIR CONTROL (IAC) VALVE
MF-33
557 Author
: Date
:
1996 TERCEL (RM440U)
IDLE AIR CONTROL (IAC) VALVE
ON-VEHICLE INSPECTION
1. INSPECT IAC VALVE OPERATION
(a) Initial conditions:

Engine at normal operating temperature

Idle speed set correctly

Transmission in neutral position
(b) Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
(c) After engine rpm is kept at 900 - 1,300 rpm for 5 seconds,
check that it returns to idle speed.
If the rpm operation is not as specified, check the IAC valve, wir-
ing and ECM.
(d) Remove the SST from the DLC1.
SST 09843-18020
2. INSPECT IAC VALVE RESISTANCE
NOTICE:
ºColdº and ºHotº in the following sentences express the temper-
ature of the coils themselves. ºColdº is from -10°C (14°F) to 50°C
(122°F) and ºHotº is from 50°C (122°F) to 100°C (212°F).
(a) Disconnect the IAC valve connector.
(b) Using an ohmmeter, measure the resistance between ter-
minal +B and other terminals (RSC, RSO).
Resistance:
Cold17.0 - 24.5 W
Hot21.5 - 28.5 W
If resistance is not as specified, replace the IAC valve.
(c) Reconnect the IAC valve connector.