IB12-N-001E

SB-10058043-7875
IMPORTANT SERVICE
INFORMATION FOR:
 SERVICE MANAGER
 SERVICE ADVISOR
 TECHNICIAN
 PARTS DEPARTMENT
 WARRANTY PERSONNEL
BULLETIN NUMBER:
IB12-N-001E
ISSUE DATE:
MARCH 2015
GROUP:
ELECTRICAL
NO CRANK/NO START/NO SCAN TOOL COMMUNICATION CRANK/NO START/NO FUEL PRESSURE/FUEL PUMP INOPERATIVE EXTREME COLD WEATHER
AFFECTED VEHICLES
• 2007-2015MY Isuzu N-Series
Equipped with 5.2L (4HK1) Diesel Engine and Diesel Particulate Filter (DPF)
• 2008-2015MY Isuzu N-Series
Equipped with 6.0L Gasoline Engines
This bulletin supersedes IB12-N-001D. This bulletin is being revised to show the
locations of the X-22 and X-28 relays. Please discard bulletin IB12-N-001D.
INFORMATION
This bulletin applies to specific regions where ambient temperatures can fall below -20°C/-4°F.
Some customers may experience a no crank/no start condition when ambient temperatures fall
to or below -20°C/-4°F. Vehicles equipped with a Multi Information Display (MID) will show the
error code P1464.
Condition
No Crank, No Start, No Communication with
ECM
Engine Cranks, No Start, No Fuel Pressure,
Fuel Pump Inoperative
Engine Type
Affected Relay(s)
6.0L, Gas
X-28
5.2L, Diesel (4HK1)
X-30
6.0L, Gas
X-22
No Communication with ECM (5.L Diesel (4HK1) / 6.0L Gas)
In most cases, this condition is the result of a stuck ECM Main Relay and can be confirmed by
connecting IDSS. If IDSS cannot communicate with the vehicle, the ECM has not powered up
due to the frozen relay.
NOTE: If IDSS communicates normally, it is not a frozen ECM Main Relay. Follow normal
diagnostics to correct the concern.
Engine Cranks, No Start, No Fuel Pressure, Fuel Pump Inoperative (6.0L Gas)
The X-22 fuel pump relay may also become stuck due to extreme cold weather conditions.
Customers may experience: crank, no start, no fuel pressure, fuel pump inoperative.
Now Available – Improved Relay
Isuzu is happy to announce the availability of a new relay with improved performance for these
conditions. Installation of the new relay requires a small modification to the relay box cover.
Follow the service procedure provided in this bulletin to properly install the new relay.
SERVICE PROCEDURE
1.
2.
3.
4.
Remove relay box cover.
Remove the original ECM Main Relay in locations X-30 (diesel) or X-22 or X-28 (gas).
Install the new relay at locations X-30 (diesel) or X-22 or X-28 (gas).
Locate the relay box cover rib(s) as shown in Figure 1.
X-22 Relay (gas)
X-30 Relay (diesel);
X-28 Relay (gas)
X-30 Relay
(diesel)
X-28 Relay
(gas)
X-22 Relay
(gas)
Figure 1 – Locate the relay(s) and the relay cover
rib(s).
Figure 2 – Cut at the dashed line (4HK1 diesel engine,
shown).
5. Trim the relay cover rib(s) approximately 3mm to provide clearance for the new relay(s).
6. Install the relay cover and confirm it seals properly. If the cover does not close properly,
trim additional material from the cover until it correctly seals.
PARTS INFORMATION
Parts can be ordered from American Isuzu Parts Distribution Network (AIPDN).
Part Number
8-98167-260-0
Description
Relay
Qty
1
WARRANTY INFORMATION
For vehicles repaired under warranty, use the labor operation code provided below.
Operation Code
N2827
Description
Powertrain System Relay, Replace
Labor Time
See Published Labor Time