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HOMESERVICE MANUALSINFINITI2019Q70 3.7 LUXE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 13 (ENGINE CONTROL SYSTEM (5.6L) (DTC/CIRCUIT DIAGNOSIS) (6 OF 9))DTC/CIRCUIT DIAGNOSISDTC P1233, P2101: ELECTRIC THROTTLE CONTROL FUNCTIONDIAGNOSIS PROCEDURE
2019 Infiniti Q70 3.7 Luxe, AWD

Diagnosis Procedure

2019 Infiniti Q70 3.7 Luxe, AWDSECTION Diagnosis Procedure
WARNING: This page is about a different variant/trim than selected.
  1. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I 

    Check the voltage between ECM harness connector terminals as per the following.

    DTC

    ECM

    Condition

    Voltage (V)

    +

    -

    Connector

    Terminal

    Connector

    Terminal

    P1233

    F117

    111

    F116

    10

    Ignition switch OFF

    Approx. 0

    P2101

    Ignition switch ON

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 2.

  2. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect IPDM E/R harness connector E5.
    4. Check the continuity between IPDM E/R harness connector and ECM harness connector.

      IPDM E/R

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E5

      7

      F117

      111

      Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between ECM and IPDM E/R
    • Loose or poor connection for each connector and harness

    Repair open circuit, short to ground or short to power in harness or connectors.

  4. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II 
    1. Check the continuity between IPDM E/R harness connector and ECM harness connector.

      DTC

      IPDM E/R

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      P1233

      P2101

      E7

      71

      F117

      99

      Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between ECM and IPDM E/R
    • Loose or poor connection for each connector and harness

    Repair open circuit, short to ground or short to power in harness or connectors.

  6. CHECK FUSE 
    1. Disconnect 15 A fuse (No. 50) from IPDM E/R.
    2. Check if 15 A fuse is blown.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Replace 15 A fuse.

  7. CHECK INTERMITTENT INCIDENT 

    Refer to Intermittent Incident .

    Is the inspection result normal?

    YES

    Replace IPDM E/R. Refer to Removal and Installation .

    NO

    Repair or replace harness or connectors.

  8. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect electric throttle control actuator harness connector.
    3. Disconnect ECM harness connector.
    4. Check the continuity between electric throttle control actuator harness connector and ECM harness connector.

      DTC

      Electric throttle control actuator

      ECM

      Continuity

      Bank

      Connector

      Terminal

      Connector

      Terminal

      P1233

      2

      F64

      5

      F117

      109

      Not existed

      110

      Existed

      6

      109

      Existed

      110

      Not existed

      P2101

      1

      F66

      5

      F117

      107

      Not existed

      108

      Existed

      6

      107

      Existed

      108

      Not existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    Repair or replace malfunctioning part.

  9. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY 
    1. Remove the intake air duct. Refer to Exploded View .
    2. Check that no foreign matter is caught between the throttle valve and the housing.

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    Remove the foreign matter and clean the electric throttle control actuator inside, and then perform throttle valve closed position learning. Refer to Description .

  10. CHECK THROTTLE CONTROL MOTOR 

    Refer to Component Inspection (Electric Throttle Control Motor) .

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

    GO TO 12.

  11. CHECK INTERMITTENT INCIDENT 

    Refer to Intermittent Incident .

    Is the inspection result normal?

    YES

    GO TO 12.

    NO

    Repair or replace harness or connectors.

  12. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR 

    Replace malfunction electric throttle control actuator. Refer to Removal and Installation .

    INSPECTION END

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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