IK1201103 ­ 1209­0 EBP Above Desired During Acceleration

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Document
ID:

IK1201103

Availability:

ISIS, Bus ISIS, FleetISIS

Revision:

8

Major System: ENGINES

Created:

3/18/2014

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Modified:

3/9/2015

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Author:

Jaime
Ochoa

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Title : 1209-0 EBP Above Desired During Acceleration
Applies To : 2010 MaxxForce DT, 9 and 10 emissions engines 2013 MaxxForce DT, 9 and 10
emissions engines (OBD) 2014 N9/N10
CHANGE LOG
4/16/14- Added EGR Valve diagnostic iKnow article. 7/24/14­ Added EGT sensor information for EPA 2010 MaxxForce 9/10. 2/3/15 ­ Updated step
1 and updated Author for feedback purposes 3/8/2015 Added new step 2/check IMT sensor

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Description
High Exhaust Backpressure Repair Plan
1209-0 EBP Above Desired Level is present

Symptom
When under acceleration the CEL or check engine light will illuminate on and then off after you let off the throttle:
• For EPA 2010/2013 MaxxForce 9 and 10 engines, the Exhaust Gas Temperature (EGT) sensor may have failed causing

SPN 1209 FMI 0 fault in calibrations ending in XHRD and newer.
• For EPA 2010/2013 MaxxForce DT, 9 and 10 engines or EPA 2014 N9/N10, high EBP fault may occur if there's an issue

with the wastegate actuator or BCS.
Possible Diagnostic Trouble Codes

SPN

FMI

Module

Description

1209

0

ECM

EBP Above Desired

1209

3

ECM

EBP Signal Out Of Range High

Exhaust Gas Temperature (EGT) Sensor Diagnostics:
Step Action
1
Is this unit an EPA 2010 or EPA 2013 (OBD) MaxxForce 9 or 10?
Note: This does not apply to pre-EPA 2010 engines
Do the last four characters of the calibration (Software Identification in
ServiceMaxx) show XHRD/XUR_/XWR0 (EPA 2010) or ECR_/EER_/EGR_?
(Figure 1)
Step Action
2

Decision
Yes: Go to step 2
No: Update calibration and
retest for issue

Decision

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IK1201103 ­ 1209­0 EBP Above Desired During Acceleration

Check the Intake Manifold Temperature (IMT) signal in ServiceMaxx after a
cold soak and after a test drive. Is the temperature biased after cold soak
(temperature sensors should be within 20 F of each other)? Does signal
look reasonable after test drive (temperature should not be reading
negative).

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Yes: Inspect IMT wiring and
sensor. Repair/replace as
needed.
No: Go to step 3

Is temperature signal is biased?
Step Action
3
Please check the Exhaust Gas Temperature (EGT) signal in ServiceMaxx.
Start engine, run at high idle and note if the temperature goes up. The
temperature should eventually start increasing.

Decision
Yes: Go to step 7
No: Go to step 4

Does the temperature increase?
Step Action
4
Is the temperature stuck at 284 F?

Decision
Yes: Go to step 5
No: Go to step 7

Step Action
5
Please check EGT sensor resistance. If reading open, proceed to replace
sensor (sensor location in Figure 2).
If there's wiring or sensor damage, please make repairs as needed.

Decision
Yes: Go to step 6
No: Go to step 7

Was the sensor replaced or wiring repaired?

Step Action
6
Once EGT sensor is repaired/replaced, test drive the unit for fault.

Decision
Yes: Go to step 7

Does 1209 faults return?
No: High EBP issue is
repaired

Figure 1. Software Identification needs to end in XHRD/XUR_ or ECR_/EER_

Figure 2. Exhaust Gas Temperature (EGT) sensor location (front part of exhaust manifold)

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IK1201103 ­ 1209­0 EBP Above Desired During Acceleration

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Hose and Solenoid Diagnostics:
Step
7

Action

Inspect all Boost Control Solenoid (BCS) and wastegate hoses to confirm all are
secured in correct locations.

Decision
Yes: Go to step 8
No: Route lines to proper

Step
8

Are all lines in the correct locations?

locations according to picture of
BCS overview

Action

Decision
Yes: Replace broken, leaking or

Lines may become brittle and loose over time, causing them to disconnect from
components.

plugged lines
No: Go to step 9

Are any of the lines broken, leaking or plugged?

Step
9

Action

KOEO – blow through the supply line; verify air passes to the Wastegate
Actuator and not to the dump.

Decision
Yes: Replace the BCS valve
No: Go to step 10

Is air flowing out the dump? (See Figure 3)

Step

Action

Decision

10

KOER at idle – supply air to the boost supply line – air should not flow through
the valve.

Yes: Replace the BCS valve
No: Go to step 11 (Wastegate Actuator
Diagnostics)

Does air flow through the valve? (See Figure 4)

Operation:
• KOEO – Passes air from Supply line to Waste Gate Actuator line.
• The ECM supplies PWM to the valve.
◦ 0 % duty cycle – acts like KOEO

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IK1201103 ­ 1209­0 EBP Above Desired During Acceleration

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◦ Voltage applied - solenoid pulls valve toward the supply side and blocks boost from the wastegate actuator line and

the dump to intake. In this position the dump and the wastegate actuator line should be open to each other.
• KOER – The ECM applies voltage and does not allow pressure to the wastegate. The valve closes and the wastegate is

closed. When backpressure becomes too high the valve allows some pressure to pass which opens the wastegate. This
is opposite from what the service manual says. (EGES 450 page 19).
• If it leaks while engine is running it may cause
◦ Low back pressure.
◦ Low boost.
• If it does not open when commanded
◦ High back pressure.

Figure 3: KOEO Test
Supply Air to the Boost Supply Line – Air should exit the Wastegate Actuator Line and no air should be flowing out the Dump.

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IK1201103 ­ 1209­0 EBP Above Desired During Acceleration

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Figure 4: KOER at idle Test
Supply Air to the Boost Supply Line – Air should not Flow through the valve.
If test results indicate a faulty solenoid, replace the BCS PN: 62094130008

Wastegate Actuator Diagnostics:
Step
11

Step
12

Action

Apply 8psi of shop air to Wastegate Actuator.

Decision
Yes: Replace wastegate actuator

Does the actuator leak?

No: Go to step 12

Action

Decision
Yes: Replace wastegate

With 8psi on Wastegate Actuator, does the Actuator Rod move?

actuator

Step
13

Note: Wastegate actuator will slightly expand with 8 psi (~ 1 mm
movement). This does not deem the actuator faulty.

No: Go to step 13