2008 toyota highlander

Asked by Jan 14, 2017 at 02:22 PM about the 2008 Toyota Highlander

Question type: General

Code p0354;p2237;p0354

1 Answer

78,055

P0354 TOYOTA - Ignition Coil 4 Primary/Secondary Circuit... Possible causes Faulty Ignition Coil 4 Ignition Coil 4 harness is open or shorted Ignition Coil 4 circuit poor electrical connection Faulty Engine Control Module (ECM)... Each ignition circuit is continuously monitored by the Engine Control Module (ECM). The test fails when the ECM does not receive a valid pulse signal from the ignition coil. Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) Lack/Loss of Power Engine may be harder to start Engine hesitation Rough engine idle P0354 Toyota Description The ignition system on the vehicle uses individual ignition coils for each cylinder. The Engine Control Module (ECM) controls each ignition coil operation. The ECM sends a ON/OFF signal to energize the ignition coil to create a spark at the spark plug when a spark is required at the cylinder...........P2237 TOYOTA - A/F Sensor Bank 1 Open Circuit... Possible causes Faulty EFI Relay Faulty Air/Fuel Sensor Bank 1 Air/Fuel Sensor Bank 1 harness is open or shorted Air/Fuel Sensor Bank 1 circuit poor electrical connection Faulty Engine Control Module (ECM)... Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) P2237 Toyota Description The Air-Fuel ratio (A/F) sensor provides output voltage approximately equal to the existing air-fuel ratio. The A/F sensor output voltage is used to provide feedback for the Engine Control Module (ECM) to control the air-fuel ratio. With the A/F sensor output, the ECM can determine deviation from the stoichiometric air-fuel ratio and control proper injection time. If the A/F sensor is malfunctioning, the ECM is unable to accurately control air-fuel ratio. The A/F sensor is equipped with a heater which heats the zirconia element. The heater is also controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), current flows to the heater which heats the sensor to facilitate detection of accurate oxygen concentration. The A/F sensor is a planar type. Compared to a conventional type, the sensor and heater portions are narrower. Because the heat of the heater is conducted through the alumina to zirconia (of the sensor portion), sensor activation is accelerated. The code is output when there is an open or short in the A/F sensor circuit, or if A/F sensor output drops. To detect these problems, the voltage of the A/F sensor is monitored when turning the ignition switch to the ON position, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the A/F sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is outside of the specified range, or the admittance is less than the standard value, the ECM will determine that there is a malfunction in the A/F sensor. If the same malfunction is detected in the next driving cycle, the MIL is illuminated and a DTC is set.

1 of 1 people found this helpful.

Your Answer

Toyota Highlander Experts

  • #1
    Wendy Tucker
    Reputation
    4,600
  • #2
    Tom Demyan
    Reputation
    4,130
  • #3
    Shawntele Lewis
    Reputation
    2,480
View All

Related Models For Sale

Used Honda Pilot
672 Great Deals out of 36,158 listings starting at $1,750
Used Toyota 4Runner
296 Great Deals out of 27,600 listings starting at $1,900
Used Toyota RAV4
712 Great Deals out of 54,881 listings starting at $1,995
Used Toyota Camry
1,082 Great Deals out of 75,991 listings starting at $1,000
Used Acura MDX
426 Great Deals out of 13,810 listings starting at $2,000
Used Honda CR-V
750 Great Deals out of 53,117 listings starting at $1,500
Used Toyota Highlander Hybrid
26 Great Deals out of 1,712 listings starting at $2,297
Used Nissan Pathfinder
490 Great Deals out of 23,855 listings starting at $895
Used Ford Explorer
1,166 Great Deals out of 64,662 listings starting at $1,200
Used Toyota Sienna
406 Great Deals out of 19,553 listings starting at $1,290
Used Lexus RX 350
538 Great Deals out of 17,722 listings starting at $3,000
Used GMC Acadia
912 Great Deals out of 45,701 listings starting at $2,990
Used Toyota Tacoma
648 Great Deals out of 40,818 listings starting at $2,000
Used Toyota Sequoia
133 Great Deals out of 4,905 listings starting at $2,600
Used Jeep Grand Cherokee
930 Great Deals out of 67,562 listings starting at $950

Used Cars For Sale

2018 Toyota Highlander For Sale
22,796 listings starting at $29,334
2017 Toyota Highlander For Sale
18 Great Deals out of 1,935 listings starting at $24,992
2016 Toyota Highlander For Sale
89 Great Deals out of 2,106 listings starting at $19,900
2015 Toyota Highlander For Sale
162 Great Deals out of 3,482 listings starting at $18,998
2014 Toyota Highlander For Sale
60 Great Deals out of 989 listings starting at $17,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.