27. DTC: P0508, Idle Speed Regulator Control Circuit Voltage Too Low (see Table 1-40) Table 1-40 28. DTC: P0509, Idle Speed Regulator Control Circuit Voltage Too High (see Table 1-41) Table 1-41 29. DTC: P0511, Idle Speed Regulator Control Circuit Trouble (see Table 1-42) Table 1-42 61 S/N Operation Test Results Actions 1 Connect the diagnostic instrument and adapter, and turn the ignition switch to ON. 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℃?
Yes Next step 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 S/N Operation Test Results Actions 1 Connect the diagnostic instrument and adapter, and turn the ignition switch to ON. 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℃? Yes Next step No Replace stepper motor 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.
Yes Repair or replace harness No Diagnosis help S/N Operation Test Results Actions 1 Connect the diagnostic instrument and adapter, and turn the ignition switch to ON. 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℃? Yes Next step No Replace stepper motor 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. Yes Repair or replace harness No Diagnosis help