Service Hints

E2 (A), E3 (B), E4 (C), ES (D) ENGINE CONTROL MODULE
BATT - E1 : Always 9.0 - 14.0 volts
+B - E1 : 9.0 - 14.0 volts (Ignition SW at ON position)
VC - E2 : 4.5 - 5.5 volts (Ignition SW at ON position)
VTA - E2 : 0.3 - 0.8 volts (Ignition SW ON and throttle valve fully closed)
: 3.2 - 4.9 volts (Ignition SW ON and throttle valve open)
THA - E2 : 0.5 - 3.4 volts (Ignition SW ON and intake air temp. 20 °C, 68 °F)
THW - E2 : 0.2 - 1.0 volts (Ignition SW ON and coolant temp. 80 °C, 176 °F)
STA - E1 : 6.0 - 14.0 volts (Engine cranking)
W - E1 : 9.0 - 14.0 volts (No trouble and engine running)
STP - E1 : 9.0 - 14.0 volts (Brake pedal depress)
RSO - E1 : 9.0 - 14.0 volts (Ignition SW at ON position)
IGT1, IGT2, IGT3, IGT4 - E1 : 0.8 - 1.2 volts (Engine cranking or idling)
#10, #20, #30, #40-E01, E02 : 9.0 - 14.0 volts (Ignition SW at ON position)

RESISTANCE OF ECU WIRING CONNECTORS
(Disconnect wiring connector)
VTA - E2 : 3.3 - 10.0 kOhm Throttle valve fully open)
: 0.2 - 0.8 kOhm Throttle valve fully closed)
VC - E2 : 3.0 - 7.0 kOhm
THA - E2 : 2.0 - 3.0 kOhm (Intake air temp. 20 °C, 68 °F)
THW - E2 : 0.2 - 0.4 kOhm (Coolant temp. 80 °C, 178 °F)
RSO : 19.3 - 22.3 kOhm

C/OPN RELAY
5 - 3 : Closed with the starter cranking and engine running

EFI RELAY
3 - 5 : Closed with the ignition SW at ON or ST position

E6 ENGINE COOLANT TEMP. SENSOR
1 - 2 : 10.0 - 20.0 kOhm (-20 °C, -4 °F)
: 4.0 - 7.0 kOhm (0 °C, 32 °F)
: 2.0 - 3.0 kOhm (20 °C, 68 °F)
: 0.9 - 1.3 kOhm (40 °C, 104 °F)
: 0.4 - 0.7 kOhm (60 °C, 140 °F)
: 0.2 - 0.4 kOhm (80 °C, 176 °F)