SERVICE MANUAL
INFORMATION

Group:
Bulletin No:
Issue Date:

SERVICE MANUAL UPDATE
SB-15-041
11-17-2015

Subject: CORRECTION OF WORKSHOP MANUAL FOR HINO CONVENTIONAL
Revision of Troubleshooting Procedure for P20EE
RELEVANT MODEL: 15MY-16MY Conventional Trucks
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:

In the event that a vehicle exhibits a P20EE, an update is available to the current
published diagnostic troubleshooting work procedure.
*All changes will be reflected in the 17MY Conventional Workshop Manual as well.
REVISED DIAGNOSTIC PROCEDURE
Inspect the NOx Sensor
Step 3(upstream) and Step 4(downstream) P20EE

ENGINE CONTROL SYSTEM (J08E)

4–825

DTC: P20EE
EN01H16F01030F03001141

P20EE: NOx converting catalyst conversion efficiency
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)

#AW #AW
H

#CQ #CQ

%JQ (CA2H)

Twist
%KM
(CA3H)
%KL
(CA3L)

%KN
(CA3L)
%KP
(CA3H)

Common rail_
CAN_J/C1

%KF
(CA3H)
%KE
(CA3L)

Twist

DEF sensor
(DEF tank temperature sensor)

LEJ
(CANL)
LEK
(CANH)

Twist

L

H

(CA2H) %JU

H

%JZ
(CA2L)

L

Twist

LG9

LFK

LGA

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

LGB

(PSR+)
(PSRS)
(PSR-)

DCU

LG8

LGC

LFQ

LGD

LFR

LGE

LFP

LGF

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

Exhaust gas
temperature
sensor (SCR inlet)

Twist
LE9
(CANH)

Engine
ECU

Twist

%JV
(CA2L)

Twist

%JW
(CA2L)
%JR
(CA2H)

#SF #SF

Twist

LE8
(CANL)

K6W
L

Common rail_
CAN_J/C3

LED
(CANH)

(CANL)

LF5 (CAH1)
LFJ
(PMP+)
LFL
LF6 (CAL1) (PMPS)
(PMP-)

#CP #CP

%JX
(CA2L)
%JS
(CA2H)

K6V
H

Twist

(CANH)

#SD #SD

L

Twist

Twist

#AV #AV

LEC
(CANL)

(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
SAPH16F010300790

1.

Technical description

• Deterioration of SCR catalyst is determined by a decision of a drop in the NOx conversion efficiency and the DEF
concentration.
• Conversion efficiency is calculated by upstream and downstream NOx sensors.
• Besides other factors, conversion efficiency may drop due to the increase or decrease of DEF amount supplied to
the sensing unit.
• DEF SCR catalyst concentration is measured by a DEF quality sensor.

• Deterioration of DEF SCR catalyst is detected.
2.

DTC set condition
(1) DTC detection condition
a. Conditions below continue for 5 seconds.
1,000 r/min ” Engine speed ” 2,500 r/min
Engine speed • 300 r/min for 3 seconds.
30 mm3/st. cyl. ” Fuel injection quantity < 150 mm3/st. cyl.
300 kg/h ” Exhaust gas mass flow < 1,000 kg/h
210 qC {410 qF} ” SCR catalyst temperature < 260 qC {500 qF}
50 ppm ” NOx (SCR upstream) < 1,000 ppm
Intake air temperature > -20 qC {-4 qF}
60 % ” Ratio of actual NH3 load < 120 %

4–826

ENGINE CONTROL SYSTEM (J08E)

Calculated HC load < 0.1 g
NOx sensor 1 (SCR upstream) and NOx sensor 2 (SCR downstream) are valid for 121 seconds.
DPF active regeneration not in process
b. Conditions below continue for 10 seconds
DEF defrosting completed (DEF take temperature) • -5 qC {23 qF}
Exhaust gas temperature (SCR inlet) > 150 qC {302 qF}
Engine speed • 350 r/min
Vehicle speed > 6.2 mph
11 V < Battery voltage < 32 V
DEF quality sensor is valid.
(2) Judgement criteria
The conditions described below are formed.
a. Calculate Average NOx conversion efficiency from NOx sensor 1 (upstream) and 2 (downstream).
Target NOx conversion efficiency (from DCU) - Average NOx conversion efficiency • 0.99
b. Average DEF concentration > 16 %
3.

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.

•
•
•
•
5.

MIL: ON
SVS Light: OFF
Engine output is restricted.
Vehicle speed is restricted.

Symptoms on the vehicle when the DTC is set

• –

• –
6.

Pre-inspection work

• Check that the battery voltage is in the normal range.
7.

After-inspection work

• Clear all past DTCs.
• Form the DTC detection condition.
• Check that no DTC is detected after test drive.
8.

Estimated failure factors

• Faulty DEF solution reduction
• Harness disconnection or short-circuit
• NOx sensor failure
• Air flow sensor failure
• Exhaust gas temperature sensor (SCR inlet) failure
• DEF quality sensor failure
• SCR catalyst: miscalculation of adsorption amount or HC poisoning
NOTICE
If no trouble causes are found , it can be suspected that the respective DTC was issued because of a temporary
fault condition caused by the freezing of the DEF.

ENGINE CONTROL SYSTEM (J08E)

4–827

INSPECTION PROCEDURE: P20EE
1

Check the DTC detected [HINO DX ൖ ]
1.

Set the starter switch to the "LOCK" position.

2.

Connect the diagnostic system (HINO DX ൖ ) to the vehicle.

3.

Set the starter switch to the "ON" position.

4.

Select [Engine] on the screen of HINO DX ൖ and check it the DTC
P20EE has been detected.

SAPH16F010300791

Has any DTC related to P20EE been detected?
YES

NO

Go to diagnosis procedure of the related
DTC.
After repair, go to step 2.

2

Go to step 2.

Check the DEF solution
1.

Check the DEF solution concentration.
Standard values
32.5 r 2.5 %

Do the measurements meet the standard value?
YES
Go to step 3.

NO
Replace the DEF solution.
If the DEF concentration is below the standard, drain the DEF solution through the tank
drain with the starter switch ON, and then
refill the tank with at least 5 liters {1.3 gallons} of DEF. Afterward, drive the vehicle and
confirm that the problem does not recur
under driving conditions.
Perform "After-inspection work" of INFORMATION section.

4–828

ENGINE CONTROL SYSTEM (J08E)

Inspect the NOx sensor 1 (SCR upstream) [HINO DX ൖ ]

3

(1)

1.

Set the starter switch to the "ON" position.

2.

Connect the vehicle to HINO DX ൖ .