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Prius ECU Diagnostic Guide

This document provides diagnostics information for a Push Button Start System DTC code B2281, which indicates that the cable and BEAN information between the power source control ECU and transmission control ECU do not match. The inspection procedure involves: 1. Reading values from the hand-held tester connected to the DLC3 port to check the shift P signal status. 2. Checking the resistance of the wire harness connectors between the two ECUs and to ground. 3. Checking if replacing the power source control ECU allows normal hybrid system starting.

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Raúl Martínez
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2K views3 pages

Prius ECU Diagnostic Guide

This document provides diagnostics information for a Push Button Start System DTC code B2281, which indicates that the cable and BEAN information between the power source control ECU and transmission control ECU do not match. The inspection procedure involves: 1. Reading values from the hand-held tester connected to the DLC3 port to check the shift P signal status. 2. Checking the resistance of the wire harness connectors between the two ECUs and to ground. 3. Checking if replacing the power source control ECU allows normal hybrid system starting.

Uploaded by

Raúl Martínez
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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05–2459

DIAGNOSTICS – PUSH BUTTON START SYSTEM 05J2I–01

DTC B2281 P SIGNAL MALFUNCTION


(CABLE–INFORMATION DOES NOT MATCH
TO BEAN–INFORMATION)

CIRCUIT DESCRIPTION
The power source control ECU and the transmission control ECU are connected by a cable and BEAN. If
the cable information and BEAN information are inconsistent, this DTC will be output.
DTC No. DTC Detection Condition Trouble Area
 Power source control ECU
Cable and BEAN between power source control ECU and
B2281  Transmission control ECU
transmission control ECU are inconsistent
 Wire harness

WIRING DIAGRAM
P6
T4 Power Source
Transmission Control ECU Control ECU

Center Connector No. 1


J14 J/C
12 2 4
W W W W
PPOS II1 4I 4J P
8 B B 5

B75961

2004 Prius – Preliminary Release (RM1075U)

Author: Date: 2623


05–2460
DIAGNOSTICS – PUSH BUTTON START SYSTEM

INSPECTION PROCEDURE
1 READ VALUE OF HAND–HELD TESTER

(a) Connect the hand–held tester (with CAN VIM) to the DLC3.
(b) Turn the power switch ON (IG) and press the hand–held tester main switch ON.
(c) Read the DATA LIST according to the displays on the tester.
Standard (Power source control ECU):
Measurement Item/Range Diagnostic
Item Normal Condition
(Display) Note
States of the Shift P Signal / ON: Shift P signal ON (Shift position is ”P”)
SHIFT P SIG –
ON or OFF OFF: Shift P signal OFF (Shift position is except ”P” position)”

OK: ”ON” (P signal is ON) appears on the screen.


NG Go to step 2

OK

REPLACE POWER SOURCE CONTROL ECU

2 CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU – TRANSMISSION


CONTROL ECU AND BODY GROUND)

Wire Harness Side (a) Disconnect the P6 and T4 ECU connectors.


P6 (b) Measure the resistance of the wire harness side connec-
P Power Source Control ECU tors.
Standard:
Tester Connection Specified Condition
P6–5 (P) – T4–8 (PPOS) Below 1 Ω
P6–5 (P) – Body ground 10 kΩ or higher

T4
Transmission Control ECU

PPOS
B80050
NG REPAIR OR REPLACE HARNESS AND CON-
NECTOR

OK

2004 Prius – Preliminary Release (RM1075U)

Author: Date: 2624


05–2461
DIAGNOSTICS – PUSH BUTTON START SYSTEM

3 CHECK OPERATION OF POWER SOURCE CONTROL ECU

(a) After replacing the power source control ECU with a normally functioning ECU, check that the hybrid
control system can start normally.
OK: Hybrid control system can start normally.
NG Go to SHIFT CONTROL SYSTEM
(See page 05–1139)

OK

NORMAL (POWER SOURCE CONTROL ECU DEFECTIVE)

2004 Prius – Preliminary Release (RM1075U)

Author: Date: 2625

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