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DI-600
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRG-01
DTC P0230 Fuel Pump Primary Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal STAR of the ECM to the starter
relay coil and also current flows to terminal STA of the ECM (STA signal).
When the STA signal and NE signal are input to the ECM, the Tr1 is turned ON, current flows to the coil of
the circuit opening relay, the relay switches on, power is supplied to the fuel pump, and the fuel pump oper-
ates.
While the NE signal is generated (engine running), the ECM keeps the Tr1 ON (circuit opening relay ON)
and the fuel pump also keeps operating.
The fuel pump speed is controlled at two levels (high speed or low speed) by the condition of the engine
(starting, light load, heavy load). When the engine starts (STA ON), the Tr2 in the ECM is OFF, so the fuel
pump relay closes and battery positive voltage is applied directly to the fuel pump. The fuel pump operates
at high speed.
After the engine starts while idling or light loads, since the Tr2 goes ON, power is supplied to the fuel pump
via the fuel pump resistor. The fuel pump operates at low speed.
ECM
EFI Relay
EFI No.1
Fuel Pump Resistor MREL
Circuit Opening
Relay
Fuel Pump Relay
FPR Tr2
IGN
Ignition Switch
AM2
Fuel Pump
Starter Relay
FC Tr1
STA
Battery Crankshaft Position NE
Sensor (NE Signal)
Starter
A21043
DI-601
DIAGNOSTICS - ENGINE (2UZ-FE)
DTC No. DTC Detecting Condition Trouble Area
S Open or short in fuel pump relay circuit
S Fuel pump relay
P0230 Open or short in fuel pump relay circuit S Circuit opening relay
S Fuel pump
S ECM
DI-602
DIAGNOSTICS - ENGINE (2UZ-FE)
WIRING DIAGRAM
F9
Engine Room J/B Fuel Pump ECM
7 6 5 Resister
G-R G-R L-O
IA2 2B 2F
Fuel Pump 4 2 1
J48 F Relay
2
L-B
3 5 2F
J/C C/OPN Relay 4 9 25 33
V V V
J49 L 2H IA1 IG3 E5 FPR
5 3 1 2
G-R 5 5 22 10
B-O G-O G-O
2C 2H IA2 E3 FC
2 1
BB1 3
1
G-R W-R
2C
Instrument Panel J/B
1 1J 1J 7
AM2
IG1
2 1C 1C 3
B-R
I18 W-R
Ignition SW
4 6 IG2 AM2 5 EFI
F19 1 No.1 EFI Relay
Fuel Pump B
2D
5 3
5 2 F10 6 8
1 21
Fusible B-W IA2 B-W
2F 2H E3 MREL
Link 1 2
4
Block
J28 Instrument Panel J/B J8
W-B B J/C J/C
W-B 12 9
A A A
1K 1F
W-B W-B
BI Battery IE
A19210 A19568
HINT:
This diagnostic chart is based on premise that engine is started. If the engine is not started, proceed to prob-
lem symptoms table on DI-452.
DI-603
DIAGNOSTICS - ENGINE (2UZ-FE)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Check voltage between terminal FPR and E1 of ECM.
CHECK:
E1
Measure the voltage between terminals of E5 and E5 ECM con-
E5 nectors.
OK:
Tester Connection Condition Specified Condition
FPR (E5-30) - E1 (E5-1) STA signal ON 9 to 14 V
FPR FPR (E5-30) - E1 (E5-1) STA signal OFF 0 to 3 V
B17411
OK Replace ECM (See page SF-82).
NG
2 Check fuel pump relay.
PREPARATION:
Remove the fuel pump relay from the engine room R/B.
CHECK:
Inspect the fuel pump relay.
OK:
Terminal No. Condition Specified Condition
Apply B+ between
3-4 No Continuity
terminals 1 and 2
A21024 3-4 Usually Continuity
3-5 Usually No Continuity
Apply B+ between
3-5 Continuity
terminals 1 and 2
NG Replace fuel pump relay.
OK
DI-604
DIAGNOSTICS - ENGINE (2UZ-FE)
3 Check for open and short in harness and connector between fuel pump relay
and ECM.
Engine Room J/B: PREPARATION:
(a) Remove the fuel pump relay from the engine room J/B.
(b) Disconnect the E5 ECM connector.
CHECK:
Measure the resistance between wire harness side connectors.
OK:
Fuel Pump
Relay Standard:
Tester Connection Specified Condition
A21377
Engine Room J/B (Fuel pump relay ter-
Below 1
minal 1) - FPR (E5-30)
E5 ECM Connector Engine Room J/B (Fuel pump relay ter-
minal 1) or FPR (E5-30) - 10 k or higher
Body ground
NG Repair or replace harness or connector.
FPR B17414
OK
Replace ECM (See page SF-82).
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