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DTC P1520 (Symptom Code B) (Flash Code 47) : To Model Index

This document provides information about Diagnostic Trouble Code (DTC) P1520 related to the neutral switch circuit on a 2007 Isuzu KB P190 engine. The DTC is set if the neutral switch signal is not detected as neutral during three consecutive driving cycles. To clear the DTC, the engine speed must be above 665 RPM and vehicle speed below 1.2 MPH with the clutch pedal released in the neutral position over two driving cycles. Diagnostic steps are provided to check the neutral switch signal with a scan tool and inspect the ECM fuse.

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3K views1 page

DTC P1520 (Symptom Code B) (Flash Code 47) : To Model Index

This document provides information about Diagnostic Trouble Code (DTC) P1520 related to the neutral switch circuit on a 2007 Isuzu KB P190 engine. The DTC is set if the neutral switch signal is not detected as neutral during three consecutive driving cycles. To clear the DTC, the engine speed must be above 665 RPM and vehicle speed below 1.2 MPH with the clutch pedal released in the neutral position over two driving cycles. Diagnostic steps are provided to check the neutral switch signal with a scan tool and inspect the ECM fuse.

Uploaded by

Daniel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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BACK TO CHAPTER INDEX ISUZU KB P190 2007

TO MODEL INDEX
Engine Control System (4JH1) 6E-213

DTC P1520 (Symptom Code B) (Flash Code 47)


Circuit Description Condition for Clearing the MIL/DTC
The neutral switch is installed on the transmission gear Important:
control box. When the gear position is neutral, the • Following conditions must be met two consecutive
switch is closed and the switch signal is provided to the driving cycles. (One driving cycle: Ignition switch
engine control module (ECM). If the ECM detects the
ON > Engine run > Ignition switch OFF for 10
neutral switch signal is not changed from other than
neutral during the predetermined engine speed and seconds)
vehicle speed range, this DTC will set. This DTC runs - The engine speed is higher than 665 RPM
only manual transmission. - The vehicle speed is lower than 2 km/h (1.2
Condition for Running the DTC MPH)
• The ignition switch is ON. - The clutch pedal is released after once
• The engine speed is higher than 665 RPM depressed
• The vehicle speed is lower than 2 km/h (1.2 MPH). - Neutral position
• The clutch pedal is released after once depressed. - After the above procedure is done, a history
Condition for Setting the DTC DTC clears after 40 consecutive driving cycles
• The ECM detects that the neutral switch signal is without a fault. Or clear with the scan tool.
continuously OFF (other than neutral) during three Diagnostic Aids
consecutive driving cycles. • If an intermittent condition is suspected, refer to
Action Taken When the DTC Sets Intermittent Conditions in this section.
• The ECM illuminates the malfunction indicator
lamp (MIL) when the diagnostic runs and fails. DTC P1520 (Symptom Code B) (Flash Code 47)
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or Engine Control Module (ECM)
Connector End Views

Step Action Value(s) Yes No


1 Did you perform the Diagnostic System Check- Go to Diagnostic
Engine Controls?  System Check-
Go to Step 2 Engine Controls
2 1. Install the scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Observe the Neutral Switch parameter with the
scan tool while shift to neutral and other 
positions.
Does the scan tool indicate ON when the position is Go to Diagnostic
neutral and OFF when other than the neutral? Aids Go to Step 3
3 1. Turn OFF the ignition.
2. Inspect the ECM (10A) fuse (EB-4) in the engine

room fuse block.
Is the ECM (10A) fuse (EB-4) open? Go to Step 4 Go to Step 5
4 Replace the ECM (10A) fuse (EB-4). If the fuse
continues to open, repair the short to ground on one
of the circuits that is fed by the ECM (10A) fuse (EB-

4) or replace the shorted attached component fed by
the ECM (10A) fuse (EB-4).
Did you complete the repair? Go to Step 13 

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