284-24 MID 128 PID 45 Pre-heating Relay

8/16/2019 284-24 MID 128 PID 45 Pre-heating Relay

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Service BulletinVolvo Truck CorporationGöteborg, Sweden

Date Group No. Release Page

6.06 284 24 01 1(5)

Trucks

MID 128 PID 45 Pre-heating relay

D7E

MID 128 PID 45 Preheater relay

T0009739

Contents• “MID 128 PID 45 Preheater relay” page 2

• “MID 128 PID 45 Preheater relay, check” page 4

20 070791ENG21826 English

Printed in Sweden



Volvo Truck Corporation Date Group No. Release Page

Service Bulletin 6.06 284 24 01 2(5)

MalfunctionMID 128 PID 45 Preheater relay

T2023245

T2023269

Fault codeFMI 3 Short circuit to battery voltage.

Conditions for fault code: • The current at EB25, exceeds 3.9 A.

Possible cause: • Short circuit in pre-heating relay.

Reaction from the engine control unit: • Fault code is set.• Yellow lamp requested.

Noticeable external symptoms: • Yellow lamp lights.• The pre-heating relay does not activate.• White smoke during cold start.

• Starting problem in cold weather.

Appropriate check: • Active FMI

28450–3 “MID 128 PID 45 Preheater relay, check”page 4 .

• Inactive FMIVCADS Pro-test: “17004–3 Fault codes, test mode”.If the fault code becomes active during test “Fault codes, test mode”, fault trace according to “Active FMI” If the fault code does not become active, try activating it during a test drive. In order to fault trace, the fault code must be active.

FMI 4 Short circuit to framework.

If the pre-heating fuse has blown SID70 FMI 4 is set.

Conditions for fault code: • The voltage at EB25 is below 30% of the battery

voltage (0,30 * U bat ).

Possible cause: • Short circuit to framework in the cabling between the

pre-heating relay and the engine control unit.

Reaction from the engine control unit: • Fault code is set.• Red light requested.

Noticeable external symptoms: • Red lamp lights.• The inlet air is hot.• The pre-heating relay cannot be switched off.


28450–3 “MID 128 PID 45 Preheater relay, check”page 4 .

• Inactive FMIVCADS Pro-test: “17004–3 Fault codes, test mode”.If the fault code becomes active during the test “Fault codes, test mode”, fault trace according to “Active FMI” If the fault code does not become active, try activating it during a test drive. In order to fault trace, the fault code must be active.





FMI 5 Break in the circuit.

Conditions for fault code: • The voltage at EB25 is between 30% and 60% of the

battery voltage (0,3 — 0,6* U bat ).

Possible cause: • Break in the cabling between the pre-heating relay and

the engine control unit.• Fault in the pre-heater relay.

Reaction from the engine control unit: • Fault code is set.• Yellow lamp requested.

Noticeable external symptoms: • Yellow lamp lights.• The pre-heating does not become activated.• White smoke during cold start.

• Starting problem in cold weather.


28450–3 “MID 128 PID 45 Preheater relay, check”page 4.

• Inactive FMIVCADS Pro-test: “17004–3 Fault codes, test mode”.If the fault code becomes active during test “Fault codes, test mode”, fault trace according to “Active FMI” If the fault code does not become active, try activating it during a test drive. In order to fault trace, the fault code must be active.





28450-3MID 128 PID 45 Preheater relay, check

Special tools: 9990014, 9998699, 88890025 Other special equipment: 9812519

Fault code informationFault code information, see “MID 128 PID 45 Preheaterrelay ” page 2 .

NOTE!

• Active/inactive fault codeCertain fault codes become inactive when theengine is turned off. Start the engine to check if thefault code is still inactive or becomes active whenthe engine is running.

• Connector block

Always check that there is no oxidation or damageto the connector pins. Also check the pin clampingforce. For more information, see service informationgroup 371.If the connector block is fault-free, reconnect it. Checkif the fault code is still set. If a fault code is set,continue fault tracing by following the instructions.

• Following any repair of the connectorRefit the connector. Check if the fault code hasbecome inactive.If a fault code is still set, continue fault tracing byfollowing the instructions.

MeasurementsNote: If any of the following cable values are incorrect,this could be the cause of the component breakdown.Also check to see if any of the component values areincorrect.

Component and Cabling: 1

T2023276

Conditions:• Resistance measurement using a multimeter.• Start key in stop position .• Component connected.

• Measurement over the component.

Measurement points Expected value

XHFE2:33 - EB:25 R ≈ 18

If the values are correct, check the voltage supply, see“Supply cable:” page 5 .If the values are incorrect, check the component, see“Component” page 5 .

9812519, 9990014, 9998699 , 88890025





Supply cable:

2

T2023275

Conditions:• Adapter connected between engine control unit cable

harness and chassis cable harness.

• Voltage measurement using a multimeter.• Start key in drive position .• Engine control unit connected.• Component connected.


XHFE2:33 - Framework U ≈ Ubat

9812519, 9998699 , 88890025

Component

3

T2023245

Conditions:• Resistance measurement using a multimeter.• Start key in stop position .• Component disconnected.• Measurement over the component.


1 - 2 R ≈ 18

Function check1Perform a function check after any corrective action using

the VCADS Pro-test: “33311-3 Pre-heating, test”.

284-24 MID 128 PID 45 Pre-heating Relay

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