MPI <4G1> -
Troubleshooting
13A-71
CHECK AT THE ENGINE-ECU TERMINALS
TERMINAL VOLTAGE CHECK CHART
The following items have been added. The ignition timing adjustment terminal (terminal No. 52) and
inhibitor switch-A/T (terminal No. 91) has been discontinued.
Terminal No. Check item
Check condition
Normal condition
10
Ignition coil - No. 1,
No. 4 (Ignition power
transistor)
Engine r/min: 3,000 r/min
0.3 - 3.0 V
20
Fan motor relay (HI)
Radiator fan is not operating (Engine
coolant temperature is 90
_
C or less)
System voltage
Radiator fan is not operating (Engine
coolant temperature is 105
_
C or
more)
0 - 3 V
21
Fan motor relay (LO)
Radiator fan and condenser fan are
not operating (Engine coolant tem-
perature is 90
_
C or less)
System voltage
Radiator fan and condenser fan are
not operating (Engine coolant tem-
perature is 90 - 105
_
C or less)
0 - 3 V
23
Ignition coil - No. 2,
No. 3 (Ignition power
transistor)
Engine r/min: 3,000 r/min
0.3 - 3.0 V
58
Engine ignition signal
Engine r/min: 3,000 r/min
0.3 - 3.0 V
88
Camshaft position
Engine: Cranking
0.4 - 3.0 V
sensor
Engine: Idling
0.5 - 2.0 V