Description
The Diagnostic System Check - Engine Controls is an organized approach to identifying a condition that is created by a malfunction in the electronic engine control system. The Diagnostic System Check must be the starting point for any driveability concern. The Diagnostic System Check directs the service technician to the next logical step in order to diagnose the concern. Understanding and correctly using the diagnostic table reduces diagnostic time, and prevents the replacement of good parts.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Lack of communication may be because of a partial or a total malfunction of the serial data circuit.
7. The presence of DTCs which begin with U, indicate that some other module is not communicating.
10. If there are other modules with DTCs set, refer to the DTC list. The DTC list directs you to the appropriate diagnostic procedure. If the control module stores multiple DTCs, diagnose the DTCs in the following order:
• Component level DTCs, such as sensor DTCs, solenoid DTCs, actuator DTCs, and relay DTCs.
Diagnose the multiple DTCs within this category in numerical order. Begin with the lowest numbered DTC, unless the diagnostic table directs you otherwise.
Diagnostic System Check Engine Controls Important:
• DO NOT perform this diagnostic if there is not a driveability concern, unless another procedure directs you to this diagnostic.
• Before you proceed with diagnosis, search for applicable service bulletins.
• Unless a diagnostic procedure instructs you, DO NOT clear the DTCs.
• If there is a condition with the starting system, refer to Starting System in Section 1E Engine Electrical.
• Ensure the battery has a full charge.
• Ensure the battery cables (+) (-) are clean and tight.
• Ensure the ECM grounds are clean, tight, and in the correct location.
• Ensure the ECM harness connectors are clean and correctly connected. DO NOT attempt to crank the engine with ECM harness connectors disconnect.
• Ensure the ECM terminals are clean and correctly mating.
• Ensure the fuel injector ID code data is correctly programmed in to the ECM.
• Ensure the immobilizer security information is correctly programmed into the ECM and immobilizer control unit (ICU).
• If there are fuel system DTC’s (P0087, P0088, P0089, P0093 or P1093), diagnose sensor DTCs, solenoid DTCs, actuator DTCs and relay DTCs first.
• If there are DPD system DTC's (P1455, P1471, P242F, P2452, P2453 or P2458), diagnose sensor DTCs solenoid DTCs, actuator DTCs and relay DTCs first.
Diagnostic System Check - Engine Controls (Euro 4 Specification)
Step Action Value(s) Yes No
1 Install a scan tool.
Does the scan tool turn ON? —
Go to Step 2
Go to Scan Tool Does Not Power Up
2
1. Turn ON the ignition, with the engine OFF.
2. Attempt to establish communication with the ECM.
Does the scan tool communicate with the ECM?
—
Go to Step 3
Go to Scan Tool Does Not Communicate with
CAN Device
3
Notice: If an immobilizer system is active the ECM will disable the fuel injection causing the engine to stall immediately after starting and energize the starter cut relay to disable cranking. Attempt to crank the engine.
Does the engine crank?
—
Go to Step 4 Go to Step 5
4
Attempt to start the engine.
Does the engine start and idle? —
Go to Step 6
Go to Engine Cranks but Does
Not Run
5
Does the scan tool display ECM DTCs P0633, P161B or U0167?
—
Go to Applicable DTC
Problem is relating to starting system.
Refer to Starting System in Section 1E Engine Electrical
6
Select the DTC display function for the following control modules:
• ECM
• Transmission control module (TCM) (Smoother only)
• Electronic hydraulic control unit (EHCU) [ABS module]
• Immobilizer control unit (ICU) (If so equipped) Does the scan tool display any DTCs?
—
Go to Step 7 Go to Step 11
7
Does the scan tool display DTCs which begin with U or other control module communication fault DTCs?
— Go to Applicable
DTC Go to Step 8
8 Does the scan tool display ECM DTCs P0601,
P0602, P0604, P0606, P060B or P1621? — Go to Applicable
DTC Go to Step 9
9 Does the scan tool display ECM DTC P0563? — Go to Applicable
DTC Go to Step 10
10 Is there any other code in any controller that has
not been diagnosed? — Go to Applicable
DTC Go to Step 11
11
Is the customer's concern with the transmission?
—
Go to Diagnostic System Check-
Transmission Controls in Section
5A Transmission
Control System Go to Step 12
12
Is the customer's concern with the anti-lock brake system?
—
Go to Diagnostic System Check - ABS Controls in Section 4C1 ABS/
ASR Go to Step 13
13
Is the customer’s concern with the immobilizer system?
—
Go to Diagnostic System Check -
Immobilizer Controls in Section
9I Security and Lock Go to Step 14
Step Action Value(s) Yes No
Diagnostic System Check - Engine Controls (Except Euro 4 Specification) 14
1. Review the following symptoms.
2. Refer to applicable symptom diagnostic table:
• Hard Start
• Rough, Unstable, or Incorrect Idle and Stalling
• High Idle Speed
• Cuts Out
• Surges
• Lack of Power, Sluggishness or Sponginess
• Hesitation, Sag or Stumble
• Abnormal Combustion Noise
• Poor Fuel Economy
• Excessive Smoke (Black Smoke)
• Excessive Smoke (White Smoke)
• DPD System Manual Regeneration Frequently
• DPD System Regeneration Long Time Did you find and correct the condition?
—
System OK
Go to Intermittent Conditions
Step Action Value(s) Yes No
1 Install a scan tool.
Does the scan tool turn ON? —
Go to Step 2
Go to Scan Tool Does Not Power Up
2
1. Turn ON the ignition, with the engine OFF.
2. Attempt to establish communication with the listed control modules.
• ECM
• Hill start aid (HSA) control unit (If so equipped)
• Supplemental restraint system (SRS) control unit (If so equipped)
• Immobilizer control unit (ICU) (If so equipped)
Does the scan tool communicate with all the listed control modules?
—
Go to Step 3
Go to Scan Tool Does Not Communicate with
Keyword Device
3
Notice: If an immobilizer system is active the ECM will disable the fuel injection causing the engine to stall immediately after starting and energize the starter cut relay to disable cranking. Attempt to crank the engine.
Does the engine crank?
—
Go to Step 4 Go to Step 5
4
Attempt to start the engine.
Does the engine start and idle? —
Go to Step 6
Go to Engine Cranks but Does
Not Run
5
Does the scan tool display ECM DTCs P0633, P161B or U0167?
—
Go to Applicable DTC
Problem is relating to starting system.
Refer to Starting System in Section 1E Engine Electrical
Step Action Value(s) Yes No
6
Select the DTC display function for the following control modules:
• ECM
• EHCU or ABS control unit (If so equipped)
• HSA control unit (If so equipped)
• SRS control unit (If so equipped)
• ICU (If so equipped)
Does the scan tool display any DTCs?
—
Go to Step 7 Go to Step 11
7
Does the scan tool display DTCs which begin with U or other control module communication fault DTCs?
— Go to Applicable
DTC Go to Step 8
8 Does the scan tool display ECM DTCs P0601,
P0602, P0604, P0606, P060B or P1621? — Go to Applicable
DTC Go to Step 9
9 Does the scan tool display ECM DTC P0563?
— Go to Applicable
DTC Go to Step 10
10 Is there any other code in any controller that has
not been diagnosed? — Go to Applicable
DTC Go to Step 11
11
Is the customer's concern with the anti-lock brake system?
—
Go to Diagnostic System Check - ABS Controls in Section 4C1 ABS/
ASR or 4C ABS Go to Step 12
12
Is the customer's concern with the HSA system?
—
Go to Diagnostic System Check - HSA Controls in
Section 4E HSA Go to Step 13
13
Is the customer's concern with the SRS airbag system?
—
Go to Diagnostic System Check - SRS Controls in Section 8C SRS
Control System Go to Step 14
14
Is the customer’s concern with the immobilizer system?
—
Go to Diagnostic System Check -
Immobilizer Controls in Section
9I Security and Lock Go to Step 15
15
1. Review the following symptoms.
2. Refer to applicable symptom diagnostic table:
• Hard Start
• Rough, Unstable, or Incorrect Idle and Stalling
• High Idle Speed
• Cuts Out
• Surges
• Lack of Power, Sluggishness or Sponginess
• Hesitation, Sag or Stumble
• Abnormal Combustion Noise
• Poor Fuel Economy
• Excessive Smoke (Black Smoke)
• Excessive Smoke (White Smoke) Did you find and correct the condition?
—
System OK
Go to Intermittent Conditions
Step Action Value(s) Yes No