2001 TOYOTA PRIUS Service Repair Manual

DI±290
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV ECU GIT and
GIVG terminals and converter & inverter G±GINV or G±GINV terminals (See page
IN±41).
HINT:
Confirm that there is no open circuit in the wire harness. The generator inverter temperature sensor circuit
has +B short if the voltage between the HV ECU GIT or GIVG terminal and body ground is always more than
5V with the ignition ON.
NG Repair or replace wire harness.
OK
Check for open in generator inverter temperature sensor and then replace converter & inverter
assembly. Check generator inverter temperature sensor (See page HV±14).

A14121
InverterHybrid Vehicle Control ECU
G±GINVB 6
I11
7
I12 G±SINVG27
GIVG
GSIV 15 H11
H11
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±291
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the line connection of the generator inverter stop signal circuit and enters the fail safe
mode (limited driving) if malfunction is detected.
DTC P3125 ± Information code 316, 318
INF. Code.Detecting ConditionTrouble Area
316+B short in generator inverter stop signal circuit
Converter & inverter assembly
318Open or GND short in generator inverter stop signal circuit

Converter & inverter assembly

Wire harness
WIRING DIAGRAM

DI±292
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV ECU GSIV and
GIVG terminals and converter & inverter assembly G±SINV and G±GINV termi-
nals (See page IN±41).
HINT:
The generator inverter stop signal circuit has +B short if the voltage between the HV ECU GSIV or GIVG
terminal and body ground is always more than 13 V with the ignition ON (ºREADYº light OFF).
NG Repair or replace wire harness.
OK
Replace converter & inverter assembly.
CIRCUIT DESCRIPTION
DTC P3125 ± Information code 317, 319, 320
INF. Code.Detecting ConditionTrouble Area
317Over voltage of inverter
319Voltage drop of inverter power source
Converter & inverter assembly
320Inverter circuit broken
Converter & inverter assembly
INSPECTION PROCEDURE
If the information code 317 or 319 is output, check if other information codes are recorded. If they are re-
corded, check and repair those codes first.
If the information code 317 or 319 alone is recorded, replace the converter & inverter assembly.
If the information code 320 is output, replace the converter & inverter assembly.

A14121
InverterHybrid Vehicle Control ECU
G±GINVB 6
I11
8
I12 G±FINVB27
GIVG
GFIV 24
H11 H11
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±293
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the line connection of the generator inverter fail signal circuit and detects malfunction.
DTC P3125 ± Information code 321, 323
INF. Code.Detecting ConditionTrouble Area
321+B short in generator inverter fail signal circuit
Converter & inverter assembly
323Open or GND short in generator inverter fail signal circuit

Converter & inverter assembly

Wire harness
WIRING DIAGRAM

DI±294
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV ECU GFIV and
GIVG terminals and converter & inverter assembly G±FINV and G±GINV terminals
(See page IN±41).
HINT:
The generator inverter fail signal circuit has +B short if the voltage between the HV ECU GFIV or GIVG termi-
nal and body ground is always more than 13 V with the ignition ON (ºREADYº light OFF).
NG Repair or replace wire harness.
OK
Replace converter & inverter assembly.
CIRCUIT DESCRIPTION
DTC P3125 ± Information code 322, 324, 325
INF. Code.Detecting ConditionTrouble Area
322Inverter overheating
324Inverter circuit broken
Converter & inverter assembly
325Inverter internal short
Converter & inverter assembly
INSPECTION PROCEDURE
If the information code 322 or 325 is output, check if other information codes are recorded. If they are re-
corded, check and repair those codes first.
If the information code 322 or 325 alone is recorded, replace the converter & inverter assembly.
If the information code 324 is output, replace the converter & inverter assembly.

A14123
InverterHybrid Vehicle
Control ECU
G±IVAB
5
I11
G±INVTL W
G
R 2
I124
I123
I121
I12
G±IWA G±IWB G±IVBGIVA
GITGIWA GIWB GIVB 19
8
18
28
23
H11H11 H11 H11 H11
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±295
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU detects the malfunction of the generator inverter current sensor. It detects the malfunction of
the sensor system, not of the high voltage system.
DTC P3125 ± Information code 326, 327, 328, 330, 332, 334, 335, 336, 338, 340
INF. Code.Detecting ConditionTrouble Area
327Open in generator inverter current sensor (V phase sub
sensor)
330Open in generator inverter current sensor (V phase main
sensor)
335Open in generator inverter current sensor (W phase sub
sensor)
338Open in generator inverter current sensor (W phase main
sensor)
326Generator inverter current sensor malfunction (V phase sub
sensor)

Converter & inverter assembly
328Generator inverter current sensor malfunction (V phase
main sensor)

Converter & inverter assembly

Wire harness
332Generator inverter current sensor V phase performance
problem
334Generator inverter current sensor malfunction (W phase
sub sensor)
336Generator inverter current sensor malfunction (W phase
main sensor)
340Generator inverter current sensor W phase performance
problem
WIRING DIAGRAM