Engine General Information and Diagnosis: 1A-193
Reference waveform No.32
VSS signal at 30 km/h (19 mph)
Resistance Check
1) Remove ECM from its bracket referring to “ECM Removal and Installation in Section 1C”.
CAUTION
!
Never touch terminals of ECM itself or connect voltmeter or ohmmeter (2).
2) Connect special tool to ECM connectors securely.
NOTE
Do not connect the other connector of special tool to ECM.
3) Check resistance between each pair of terminals of disconnected connectors (1) as listed in the following table.
CAUTION
!
• Be sure to connect ohmmeter probe from wire harness side of coupler.
• Be sure to turn OFF ignition switch for this check.
• Resistance in the following table represents that measured when parts temperature is 20 °C (68 °F).
Measurement
terminal
CH1: “E23-25” to “C37-58”
Oscilloscope
setting
CH1: 5 V/DIV, CH2: 5 V/DIV
TIME: 40 ms/DIV
Measurement
condition
• After warmed up to normal
operating temperature
• Vehicle driving at 30 km/h (19
mph)
1. VSS signal for EPS control module
2. ON
3. OFF
I6RS0C110047-01
1
2
I4RS0A110086-02
Terminals Circuit Standard resistance Condition
C37-47 to E23-29 Heater of HO2S-2 4 – 15 Ω —
E23-46 to E23-1/16 Radiator cooling fan relay No.1 160 – 240 Ω —
E23-60 to E23-29 Main relay 160 – 240 Ω
Battery disconnected
and ignition switch
turned ON
E23-15 to E23-29 Fuel pump relay 160 – 240 Ω —
C37-16 to E23-1/16 No.3 fuel injector
10.8 – 18.2 Ω —
C37-17 to E23-1/16 No.4 fuel injector
C37-4 to E23-1/16 EGR valve (stepping motor No.1 coil) 20 – 31 Ω —
C37-29 to E23-1/16 EVAP canister purge valve 28 – 35 Ω —
C37-2 to E23-1/16 No.2 fuel injector 10.8 – 18.2 Ω —
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