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Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
NO. 4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK (SKYACTIV-G 2.5, VIN M) DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 DETERMINE IF MALFUNCTION CAUSE IS OVERHEATING OR OTHER
CAUTION:
  • While performing this step, always operate the vehicle in a safe and lawful manner.
  • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
  • Access the ECT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5 (VIN M))] ).
  • Is the ECT PID value less than 116 °C {241 °F} during driving?
 Yes Go to the next step.
No The cause of this concern could be from the cooling system overheating.
2 VERIFY PCM DTC
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.5 (VIN M))] ).
No Go to the next step.
3 VERIFY CURRENT INPUT SIGNAL STATUS
CAUTION:
  • While performing this step, always operate the vehicle in a safe and lawful manner.
  • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
  • Access the following PIDs using the MMDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5 (VIN M))] ).
    • ECT
    • MAF
    • MAP
    • MAP_V
    • O2S11
    • O2S12
    • SHRTFT1
    • LONGFT1
  • Do the PIDs indicate the correct values under the malfunction condition? (See PCM INSPECTION [SKYACTIV-G 2.5 (VIN M)] ).
 Yes Go to the next step.
No ECT PID is not as specified:
4 DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER
  • Will the engine run smoothly at part throttle?
 Yes Go to Step 6.
No Go to the next step.
5 INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION
 Yes Visually inspect the throttle body (damage/scratching).
  • If there is any malfunction:
    • Repair or replace the malfunctioning part according to the inspection results.
  • If there is no malfunction:
    • Go to the next step.
No Repair or replace the malfunctioning part according to the inspection results.
6 INSPECT FUEL INJECTOR OPERATION
 Yes Go to the next step.
No Repair or replace the malfunctioning part according to the inspection results.
7 INSPECT PURGE CONTROL SYSTEM OPERATION
 Yes Go to the next step.
No Repair or replace the malfunctioning part according to the inspection results.
8 INSPECT MAF SENSOR
  • Inspect the MAF sensor for the following:
    • Contamination
  • Is there any malfunction?
 Yes Repair or replace the malfunctioning part according to the inspection results.
No Go to the next step.
9 INSPECT PCM FOR POOR GROUND
  • Verify the PCM ground point condition.
  • Is there any ground point loose or lifting in the PCM?
 Yes Repair the ground point.
No Go to the next step.
10 INSPECT RELATED PART CONDITION
 Yes Service if necessary.
  • Repeat this step.
No Go to the next step.
11 INSPECT FUEL PRESSURE (HIGH-SIDE)
 Yes Go to Step 15.
No Lower than 10 MPa {102 kgf/cm2 , 1, 450 psi}:
12 DETERMINE IF MALFUNCTION CAUSE IS FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
  • Is the vehicle acceleration performance normal?
 Yes Go to the next step.
No Go to Step 14.
13 INSPECT FUEL PRESSURE SENSOR
 Yes Replace the fuel distributor.
(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN M)] ).
No Go to Step 15.
14 INSPECT SPILL VALVE CONTROL SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND
  • Switch the ignition off.
  • Disconnect the high pressure fuel pump and PCM connectors.
  • Inspect for continuity between high pressure fuel pump terminal A (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Refer to the wiring diagram and verify whether or not there is a common connector between high pressure fuel pump terminal A and PCM terminal 1DI.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

    If the malfunction remains:

  • Replace the PCM. (damage to driver in PCM) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN M)] ).
No Replace the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN M)] ).
15 INSPECT FUEL PRESSURE (LOW-SIDE)
 Yes Go to the next step.
No Inspect the following:
16 INSPECT STARTING SYSTEM
 Yes Go to the next step.
No Repair or replace the malfunctioning part according to the inspection results.
17 INSPECT ENGINE COMPRESSION
 Yes Go to Step 23.
No Go to the next step.
18 INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER
 Yes Replace the electric variable valve timing motor/driver.
(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN M)] ).
No Go to the next step.
19 INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR
 Yes Replace the electric variable valve timing motor/driver.
(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN M)] ).
No Go to the next step.
20 INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR
 Yes Replace the electric variable valve timing actuator.
(See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN M)] ).
No Go to the next step.
21 INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
 Yes Repair or replace the malfunctioning part according to the inspection results.
No Go to the next step.
22 INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING
 Yes Inspect for the following engine internal parts:
  • Cylinder
  • Piston ring
  • Intake valve
  • Exhaust valve
  • Such as cylinder head gasket
    • If there is any malfunction:
      • Repair or replace the malfunctioning part according to the inspection results.
No Adjust the valve timing to the correct timing.
23 INSPECT IGNITION SYSTEM OPERATION
 Yes Go to the next step.
No Repair or replace the malfunctioning part according to the inspection results.
24 INSPECT EXHAUST SYSTEM FOR RESTRICTION
  • Inspect for restriction in the exhaust system and the TWC.
  • Is there any restriction?
 Yes Repair or replace the malfunctioning part according to the inspection results.
No Go to the next step.
25 INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR INJECTOR DRIVER (PCM INTEGRATED)
 Yes Replace the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (VIN M)] ).
No Injector driver malfunction.
26 Verify the test results.
  • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.5 (VIN M)] ).
  • If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
    • If the vehicle is repaired, troubleshooting is completed.
    • If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.
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