1 E1 - Preliminary Check

Before using this diagnostic chart:

1.   Ensure that fuel quality and quantity are  OK

2.   Ensure that engine cranking speed is OK

3.   Ensure that oil viscosity is correct

No problems found:

GO TO  2

Problem found:

Repair and retest

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2   Active DTC Test

1.   Crank engine for 15 seconds

2.   Using the DST, monitor DTCs on the active code display  parameter

No active DTCs present:

GO TO  3

Active DTC(s) present: Diagnose active DTCs first.

If any of the DTCs have a SPN of 636 or 637, go to those first.

ECU will not communicate with DST: See D1 - ECU DOES NOT COMMUNICATE

WITH DST in this Group.

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3 Cam and Crank Indicators Test

1.   Start cranking engine

2.   Using the DST, observe cam noise, crank noise, and crank status while cranking. MonitorCAM/CRANK parameters.

NOTE: For an explanation of these parameters see DATA PARAMETER DESCRIPTION in Group 160.

No cam or crank noise and crank status reaches 15:

GO TO  5

Cam or crank noise or crank status does not reach 15:

GO TO  4

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4 Vehicle Wiring Inspection Check

Inspect the vehicle for possible failures that can cause either of these  conditions:

.

1.   Bad electrical connections

2.   Damaged camshaft or crankshaft sensor

3.   Damaged camshaft or crank timing ring

4.   EMI from improperly installed radio equipment, or other electronic  devices.

5.   Once the problem is found, repair and  retest.

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5 Fuel Hand Primer Test

1.   Ignition OFF

2.   Operate the hand primer pump located on the fuel filter base until moderate resistance is felt

3.   Try to start engine

Engine starts:

GO TO  7

Engine does not start:

GO TO  6

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6   Pilot Injection Test

While cranking the engine, read the Pilot Injection parameter on the  DST.

Pilot Injection reads ON or N/A:

GO TO  6

Pilot Injection reads OFF:

Pilot Injection should be ON if the ECT is below 35°C (95°F).

If Pilot Injection is OFF under this condition, determine problem in the ECT sensor circuit.

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7 Fuel Supply System Check

Check the fuel supply system.

·   For Dual Rail fuel systems, see F1 - DUAL RAIL FUEL SUPPLY SYSTEM CHECK in this Group.

·   For Single Rail fuel systems, see F4 - SINGLE RAIL FUEL SUPPLY SYSTEM CHECK in this Group.

Fuel supply system OK:

GO TO  8

Fuel supply system problem found:

Repair fuel supply system problem and retest.

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8 EUI Cap Screw and EUI Harness and Connector Test

1.    Ignition OFF

2.   Remove rocker arm cover

NOTE: Rocker arm cover gasket is reusable if no visible damage is detected. Do not store cover resting on gasket surface.

3.   Check EUI rocker arms, valve rocker arms, and camshaft  operation.

4.    Check that the hold down clamp cap screws on all EUIs are tightened to specification.

·   For Dual Rail fuel systems, see REMOVE AND INSTALL ELECTRONIC UNIT INJECTORS (DUAL RAIL FUEL SYSTEMS) in Section 02, Group  090.

·   For Single Rail fuel systems, see REMOVE AND INSTALL ELECTRONIC UNIT INJECTORS (SINGLE RAIL FUEL SYSTEMS) in Section 02, Group  091.

5.   Inspect EUI harness and EUI harness connector for  damage.

All components operating correctly: GO TO  9

Faulty component found:

Repair faulty component and retest.

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9 Cam to Crank Timing Test

Verify cam/crank timing is correct. See CHECK AND  ADJUST

CAMSHAFT-TO-CRANKSHAFT TIMING in CTM100, Section 02, Group 050.

Cam/crank timing OK:

Replace ECU and retest.

Cam/crank timing NOT OK:

See CHECK AND ADJUST

CAMSHAFT-TO-CRANKS TIMING in CTM100,

Section 02, Group 050.

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