NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [MZR 2.0 DISI]

id0103d5801000

4

HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK
DESCRIPTION
•  Starter cranks engine at normal speed but engine requires excessive cranking time before starting.
•  Battery is operating normally.
POSSIBLE CAUSE
•  Poor fuel quality
•  Fuel leakage
•  Air leakage from intake-air system
•  Intake-air system restriction
•  Vacuum leakage
•  PCM DTC is stored
•  Improper operation of electronic throttle control system
•  EGR valve malfunction
•  Purge solenoid valve malfunction
•  Erratic signal from CMP sensor
•  Erratic signal from CKP sensor
•  Erratic signal to PCM
―  ECT sensor or related circuit malfunction
―  MAF sensor or related circuit malfunction
―  A/F sensor or related circuit malfunction
―  HO2S or related circuit malfunction
―  Improper air/fuel mixture ratio control
•  Exhaust system or TWC restriction
•  Spark plug malfunction
•  Erratic signal to ignition coils
•  Inadequate fuel pressure (high or low pressure side)
―  Fuel pressure sensor malfunction
―  High pressure fuel pump malfunction
―  Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)
―  Spill valve control solenoid valve malfunction (built-in high pressure fuel pump)
―  Relief valve malfunction (built-in fuel delivery pipe)
―  Fuel pump (low-side) resister or related circuit malfunction
―  Fuel line restriction
―  Fuel filter clogging
•  Fuel pump unit malfunction
•  Incorrect fuel injection timing
•  Fuel injector malfunction
•  Low engine compression
•  Improper valve timing
•  Starting system malfunction
•  PCV valve malfunction
•  Injector driver (built-in PCM) malfunction
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
•  Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
•  Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [MZR 2.0 DISI].) (See AFTER SERVICE PRECAUTION [MZR 2.0 DISI].)
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Inspect for the following:
•  Fuel quality (proper octane, contamination, winter/summer blend)
•  Fuel leakage
•  Intake-air system leakage or restriction
•  Vacuum leakage
Is there any malfunction?
Yes
Service if necessary.
•  Repeat this step.
No
Go to the next step.
2
Retrieve any PCM DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 2.0 DISI].)
No
Go to the next step.
3
Access the ECT PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].)
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.
•  Perform the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.
4
Will the engine run smoothly at part throttle?
Yes
Go to the next step.
No
Go to Step 6.
5
Perform the TP sweep inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.0 DISI].)
Does the electronic throttle control system work properly?
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
Perform the EGR Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.0 DISI].)
Does the EGR system operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
7
Perform the Purge Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.0 DISI].)
Does the purge solenoid valve work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
8
Inspect the CMP sensor and CKP sensor for the following:
•  Installation condition
•  Damaged trigger wheel and camshaft
•  Open or short circuit in related circuit
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
9
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 M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].)
•  ECT
•  LONGFT1
•  MAF
•  O2S11
•  O2S12
•  SHTFT1
Do the PIDs indicate the correct values under the trouble condition?
(See PCM INSPECTION [MZR 2.0 DISI].)
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
•  If the malfunction remains:
―  Perform the “INTERMITTENT CONCERN TROUBLESHOOTING” procedure.
10
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.
11
Perform the Spark Test.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.0 DISI].)
Is a strong blue spark visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
12
Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].)
Is the FUEL_PRES PID value within the specification?
(See PCM INSPECTION [MZR 2.0 DISI].)
Yes
Go to Step 17.
No
Go to the next step.
13
Is the vehicle accelerate performance normally?
Yes
Go to the next step.
No
Go to Step 15.
14
Inspect the fuel pressure sensor.
(See FUEL PRESSURE SENSOR INSPECTION [MZR 2.0 DISI].)
Is there any malfunction?
Yes
Replace the fuel delivery pipe.
(See FUEL INJECTOR REMOVAL/INSTALLATION [MZR 2.0 DISI].)
No
Go to Step 17.
15
Switch the ignition to 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
Repair or replace the wiring harness for a possible short to ground.
•  If the malfunction remains:
―  Replace the PCM. (damage to driver in PCM)
No
Go to the next step.
16
Replace the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [MZR 2.0 DISI].)
Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].)
Is the FUEL_PRES PID value within the specification?
(See PCM INSPECTION [MZR 2.0 DISI].)
Yes
High pressure fuel pump or spill valve control solenoid valve (built-in high pressure fuel pump) malfunction.
•  Symptom troubleshooting is completed.
•  Go to Step 22.
No
Relief valve (built-in fuel delivery pipe) malfunction.
•  Replace the fuel delivery pipe.
17
Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.
Measure the low side fuel pressure.
(See FUEL LINE PRESSURE INSPECTION [MZR 2.0 DISI].)
Is the low side fuel pressure within the specification?
Yes
Go to the next step.
No
Inspect for following:
•  Fuel line restriction
•  Fuel filter clogging
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results.
―  If there is no malfunction:
•  Replace the fuel pump unit.
18
Perform the Fuel Injector Operation Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.0 DISI].)
Do the fuel injectors operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
19
Measure the compression pressure for each cylinder.
(See COMPRESSION INSPECTION [MZR 2.0 DISI].)
Are the compression pressures within the specification?
Yes
Go to the next step.
No
Inspect for following:
•  Damaged valve seat
•  Worn valve stem and valve guide
•  Worn or stuck piston ring
•  Worn piston, piston ring or cylinder
•  Improper valve timing
Service if necessary.
20
Inspect the starting system.
(See STARTER INSPECTION [MZR 2.0 DISI].)
Does the starting system work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
21
Inspect the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [MZR 2.0 DISI].)
Is there any malfunction?
Yes
Replace the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZR 2.0 DISI].)
No
Injector driver is malfunction.
•  Replace the PCM.
If the malfunction remains:
•  Overhaul the engine.
22
Verify the test results.
•  If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR 2.0 DISI].)
•  If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
―  If the vehicle is repaired, troubleshooting is completed.
―  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 2.0 DISI].)