SERVICE MANUAL INFORMATION
SB-19-008 P24FE DTC WORKSHOP MANUAL
CORRECTION
GROUP: SERVICE MANUAL UPDATE
BULLETIN NO: SB-19-008
DATE: 3-22-2019

SUBJECT VEHICLES: 17MY-20MY Conventional Trucks equipped

with an J08E.

The following is to inform you of the above caption. This service
data should be attached to the relevant pages of the workshop
manuals for maintenance and to use for servicing.
OVERVIEW:

Workshop manual correction of Diagnostic Trouble Code (DTC)
P24FE.

4–1360

ENGINE CONTROL SYSTEM (J08E)

DTC: P24FE
P24FE Removal of DEF SCR catalyst
INFORMATION
(AFSG) KTQ

KTR L2P

(AFGD) KTR

L75

KTS L75

(AFVB) KTS

LUH

KTU KTD

(AFT-) KTU

K0W

KTT K0W

(AFT+) KTT

(CA1H) LCM
H

#S5 #S5

(CA1L) LCN
L

#S7 #S7

Air flow
sensor

Supply module
(DEF pump)
LF5 (CAH1)
LFJ
(PMP+)
LFL
LF6 (CAL1) (PMPS)

#AW #AW
H

Twist

#CQ #CQ

%JV
(CANL)

Twist

Twist

Twist
%KM
(CANH)
%KL
(CANL)

Common rail_
CAN_J/C1

%KF
(CANH)
%KE
(CANL)

LEJ
(CANL)
LEK
(CANH)

Twist

DEF sensor
(DEF tank temperature sensor)

L

%JZ
(CANL)

L

Twist

Twist

H

Twist

H (CANH) %JU

LG8
LG9

LFK

LGA

LFM

LGB

LEY (CAH0) (PMV+)
LEZ (CAL0)
LFN
(PMV-)

LGC

LFQ

LGD

LFR

LGE

LFP

LGF

(PSR+)
(PSRS)
(PSR-)

DCU

(PMP+)
(PMPS)
(PMP-)
(PMV+)
(PMV-)
(PSR+)
(PSRS)
(PSR-)

Exhaust gas
temperature
sensor (SCR inlet)

Twist
LE9
(CANH)

Engine
ECU

%JQ (CANH)

%JW
(CANL)
%JR
(CANH)

#SF #SF

Twist

LE8
(CANL)

K6W
L

Common rail_
CAN_J/C3

%JX
(CANL)
%JS
(CANH)

(CANL)

#CP #CP

(PMP-)

LED
(CANH)

#SD #SD

PM
sensor
LQK
(CANL)
LQN
(CANH)

K6V
H

Twist

(CANH)

L

LEC
(CANL)

Twist

#AV #AV

%KN
(CANL)
%KP
(CANH)

(AG5)
(THA+)

KTQ LCH

LUG

Twist

(AG4)
(AFVB)

LCH

Twist

(AFSI)

L

H

L

H

(EXT+) LFG
(EXT-) LFH

LE4

(FAT+)

LE5 (FAT-)

NOx
NOx
sensor 2 sensor 1
SAPH16F010301447

1.

Technical description

• Removal of the SCR catalyst will be judged if decrease in clarifying efficiency occurs.
• Conversion efficiency is calculated by upstream and downstream NOx sensors.
• Clarifying efficiency may decrease because of a decrease or increase in the added urea quantity caused by slippage of the sensor, because of a difference in the amount of adsorbed NH3 or deteriorated hardware.

• Removal of the urea SCR catalyst has been detected.
2.

DTC set condition
(1) DTC detection condition

•
•
•
•
•
•
•

Conditions below continue for 10 seconds.
1,000 r/min ” Engine speed ” 2,500 r/min
Engine speed • 300 r/min for 3 seconds.
20 mm3/st. cyl. ” Fuel injection quantity < 150 mm3/st. cyl.
200 kg/h ” Exhaust gas mass flow 1,000 kg/h
210 qC {410 qF} ” SCR catalyst temperature 340 qC {644 qF}
50 ppm ” NOx (SCR upstream) 1,000 ppm
(NOx sensor 1 (SCR upstream) stable and NOx sensor 2 (SCR downstream) stable)

• Intake air temperature ! -20 qC {-4 qF}

ENGINE CONTROL SYSTEM (J08E)

(2)

3.

• Calculated HC load 1.0 g
• NOx sensor 1 (SCR upstream) and NOx sensor 2 (SCR downstream) are valid for 121 seconds.
• DPF active regeneration not in process.
• DEF injection volume • 65 mg/sec
• DEF quality sensor is valid and 35 % • DEF quality concentration • 25 %.
Judgment criteria
• Calculate Average NOx conversion efficiency from NOx sensor 1 (upstream) and 2 (downstream).
• Average NOx conversion efficiency ” 0.03

Reset condition

• Immediately after normal operation is restored and SCR-related memory is reset.
4.

Indication, warning or system control regulation when the DTC is set.

• MIL: OFF
• SVS light: ON
5.

Symptoms on the vehicle when the DTC is set

• ±

• Engine output is insufficient.
• Vehicle does not speed up.
6.

Pre-inspection work

• Check that the battery voltage is in the normal range.
• Check that no malfunction is found by conducting the failure diagnosis system check.
7.

After-inspection work

• Clear all past DTCs.
• Reset "Urea SCR related memory".
• Check that no DTC is detected after test drive.
8.

Estimated failure factors
• Removal of urea SCR catalyst
• NOx sensor failure
• Air flow sensor failure
• Exhaust gas temperature sensor (SCR inlet) failure
• DEF injector failure
• SCR catalyst: Difference from the calculated adsorbed amount; poisoning and deterioration due to HC

4–1361

4–1362

ENGINE CONTROL SYSTEM (J08E)

INSPECTION PROCEDURE: P24FE
1

Inspect the DEF
1.

Check the DEF concentration.
Standard values
Concentration: 32.5 r 2.5 %

Do the measurements meet the standard value?