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Typical Enabling Conditions: 1 Check Other DTC Output (In Addition To DTC P0101)

This document provides information about diagnosing issues with the SFI (Sequential Fuel Injection) system, including typical enabling conditions, malfunction thresholds, and inspection procedures. It outlines the steps to check for diagnostic trouble codes (DTCs), with instructions to first address any additional codes before replacing the mass air flow sensor if only code P0101 is present. Wiring diagrams and freeze frame data are referenced to aid in troubleshooting.

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Clodoaldo Biassio
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61 views1 page

Typical Enabling Conditions: 1 Check Other DTC Output (In Addition To DTC P0101)

This document provides information about diagnosing issues with the SFI (Sequential Fuel Injection) system, including typical enabling conditions, malfunction thresholds, and inspection procedures. It outlines the steps to check for diagnostic trouble codes (DTCs), with instructions to first address any additional codes before replacing the mass air flow sensor if only code P0101 is present. Wiring diagrams and freeze frame data are referenced to aid in troubleshooting.

Uploaded by

Clodoaldo Biassio
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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05–73

DIAGNOSTICS – SFI SYSTEM (April, 2003)

TYPICAL ENABLING CONDITIONS


Specification
Item
Minimum Maximum
The monitor will run whenever the follow-
See ”List of Disable a Monitor” (On page 05–25)
ing DTCs are not present
High voltage:
Engine speed – 900 rpm
Idle ON
Engine coolant temperature 70C (158F) –
Low voltage:
Engine speed 0 rpm –
Throttle position 0.1 V –

TYPICAL MALFUNCTION THRESHOLDS


Detection Criteria Threshold
Mass air flow sensor voltage (high voltage) More than 2.2 V
Mass air flow sensor voltage (low voltage) Less than 0.4 V

WIRING DIAGRAM
Refer to DTC P0100 on page 05–65.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether
the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich,
etc. at the time of the malfunction.
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO DTC P0101)

(a) Connect the hand–held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand–held tester or the OBD II scan tool main switch ON.
(c) Select the item ”DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES”.
(d) Read the DTCs.
Result:
Display (DTC output) Proceed to
P0101 and other DTCs A
P0101 B
HINT:
If any other codes besides P0101 are output, perform the troubleshooting for those DTCs first.
B REPLACE MASS AIR FLOW SENSOR

GO TO RELEVANT DTC CHART (See page 05–35)

2004 COROLLA (RM1037U)

Author: Date: 238

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