27. DTC: P0508, Idle Speed Regulator Control Circuit Voltage Too Low (see Table 1-40)
Table 1-40
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Next step
2
Disconnect the idle speed regulator. Check the resistance
between pin A and pin D, as well as between pin B and pin C
of the regulator. Is the resistance about 53±5.3Ω under the
temperature of 20 ?℃
No
Replace stepper motor
3
Check for short to ground between the pin A, B, C, D of the
regulator and the pin 65#, 66#, 67#, 64# of the ECU.
Yes
Repair or replace
harness
28. DTC: P0509, Idle Speed Regulator Control Circuit Voltage Too High (see Table 1-41)
Table 1-41
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Next step
2
Disconnect the idle speed regulator. Check the resistance
between pin A and pin D, as well as between pin B and pin C
of the regulator. Is the resistance about 53±5.3Ω under the
temperature of 20 ?℃
No Replace stepper motor
Yes
Repair or replace
harness
3
Check for short to power supply between the pin A, B, C, D
of the regulator and the pin 65#, 66#, 67#, 64# of the ECU.
No Diagnosis help
29. DTC: P0511, Idle Speed Regulator Control Circuit Trouble (see Table 1-42)
Table 1-42
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Next step
2
Disconnect the idle speed regulator. Check the resistance
between pin A and pin D, as well as between pin B and pin C
of the regulator. Is the resistance about 53±5.3Ω under the
temperature of 20 ?℃
No Replace stepper motor
Yes
Repair or replace
harness
3
Check for open circuit between the pin A, B, C, D of the
regulator and the pin 65#, 66#, 67#, 64# of the ECU.
No
Diagnosis help
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