Isuzu N-Series. Manual — part 464

6E-192 EMISSION AND ELECTRICAL DIAGNOSIS

DTC-52 Electronically Erasable Programmable Read Only Memory (EEPROM) Error

Step

Action

Value

YES

NO

1

Was the “Diagnostic system check” per-
formed?

—

Go to Step 2

Go to diagnostic

system check

2

Using the DVM, check the resistance between
terminal number 4 and 5 of the Relay.

Does the DVM read the following Value?

23

Ω (for 12

Volt)

100

Ω (for 24

Volt)

Go to Step 3

Go to Step 4

3

1. Ignition “OFF”
2. Disconnect the ECM connector from

ECM.

3. Check the short to voltage of Relay circuit

between the ECM and Relay connector

4. Repair if necessary.

Has DTC 42 been corrected?

—

Go to Step 6

Go to Step 5

4

Replace the Relay.

Is the action complete?

—

Go to Step 6

—

5

Replace the ECM.

Is the action complete?

—

Go to Step 6

—

6

1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”

Does DTC 42 come normal condition?

—

Go to Step 7

Go to Step 2

7

Is any current trouble other than DTC 42 dis-
played by indicator light?

—

Go to trouble code

section

Trouble code clear

Step

Action

Value

YES

NO

1

Was the “Diagnostic system check” per-
formed?

—

Go to Step 2

Go to diagnostic

system check

2

Replace the ECM.

Is the action complete?

—

Go to Step 3

—

3

1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”

Is DTC 52 all right under Scan Tool Check?

—

Go to Step 4

Go to Step 2

4

Is any current trouble other than DTC 52 dis-
played by indicator light?

—

Go to trouble code

section

Trouble code clear

EMISSION AND ELECTRICAL DIAGNOSIS 6E-193

WITHOUT DIAGNOSIS TROUBLE CODE

Introduction
If there occurs a malfunction although no Diagnostic
Trouble Code (DTC) is generated, then inspect and re-
pair the system in accordance with the flowcharts given
on the following pages.

When a Diagnostic Trouble Code (DTC) is produced, in-
spect and repair system with reference to “EMISSION
AND ELECTRICAL DIAGNOSIS”

6E-194 EMISSION AND ELECTRICAL DIAGNOSIS

Startup Failure (Quick On Start (QOS) only)

N6A1341E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-195

Notice:
The condition of the system in which the malfunction has occurred should be checked by making comparisons be-
tween the vehicle Engine Control Module (ECM) and the checking ECM.

N6A1342E